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Ответы на тесты Statistics.d

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Бесплатные ответы на тесты по предмету «Statistics.d» — Синергия и МТИ

Вопрос 1Ответ открыт бесплатно

Price relatives computed for chain base method are called

  1. Link Relatives✓ Правильный ответ
  2. Simple Indices
  3. Price Relatives
  4. Chain Inices
✓ Правильный ответ

Link Relatives

Вопрос 2

In the fix base method, the base period should be

  1. Median
  2. Large
  3. Mean
  4. Normal
Вопрос 3

The most suitable average for index numbers is

  1. Geometric Mean
  2. Arithmetic Mean
  3. Median
  4. Harmonic Mean
Вопрос 4

The index for the base period is always taken as

  1. 200
  2. 100
  3. Zero
  4. Ten
Вопрос 5

Find the mode of the call received on 7 consecutive days 11,13,13,17,19,23,25

  1. 25
  2. 23
  3. 13
  4. 17
Вопрос 6Ответ открыт бесплатно

When the Mean of a number is 18, what is the Mean of the sampling distribution?

  1. 18✓ Правильный ответ
  2. 21
  3. 27
  4. 23
✓ Правильный ответ

18

Вопрос 7

Find the arithmetic mean of the set of data: 6,1,5,8, and 10

  1. 4
  2. 5
  3. 6
  4. 9
Вопрос 8

Poisson distribution is applied for

  1. Regular Random Variable
  2. Discrete Random Variable
  3. Constant Time Function
  4. Irregular Random Variable
Вопрос 9

Find the range of the following data sets 61,22,34,17,81,99,42,94.

  1. 81
  2. 82
  3. 98
  4. 90
Вопрос 10Ответ открыт бесплатно

The relationship between two variables partialling out the effect that a third variable has on one of those variables can be expressed using a:

  1. Partial Correlation
  2. Semi-Partial Correlation✓ Правильный ответ
  3. Bivariate Correlation
  4. Point-biserial Correlation
✓ Правильный ответ

Semi-Partial Correlation

Вопрос 11

A café owner decided to calculate how much revenue he gained from lattes each month. What type of variable would the amount of revenue gained from lattes be?

  1. Categorical
  2. Continuous
  3. Discrete
  4. Nominal
Вопрос 12

If a test is valid, what does this mean?

  1. The test will give consistent results
  2. The test measures what it claims to measure.
  3. The test has internal consistency.
  4. The test measures a useful construct or variable.
Вопрос 13Ответ открыт бесплатно

When questionnaire scores predict or correspond with external measures of the same construct that the questionnaire measures it is said to have:

  1. Factorial Validity
  2. Criterion Validity✓ Правильный ответ
  3. Ecological Validity
  4. Content Validity
✓ Правильный ответ

Criterion Validity

Вопрос 14

A café owner wanted to compare how much revenue he gained from lattes across different months of the year. What type of variable is ‘month’?

  1. Dependent
  2. Categorical
  3. Interval
  4. Continuous
Вопрос 15

Which of the following is appropriate to graph a single categorical variable?

  1. Histogram
  2. Scatterplot
  3. Boxplot
  4. Bar chart
Вопрос 16Ответ открыт бесплатно

Which of the following is not a recommended type of graph and cannot compare the complex data?

  1. Pie chart✓ Правильный ответ
  2. Boxplot
  3. Histogram
  4. Waffle chart
✓ Правильный ответ

Pie chart

Вопрос 17

Density plots, histograms, and boxplots can all be used to

  1. examine frequencies in categories of a factor.
  2. examine the distribution of a continuous variable.
  3. examine the relationship between two categorical variables.
  4. determine whether two continuous variables are related.
Вопрос 18

Custom functions are useful when doing which of the following?

  1. Loading a library
  2. Doing the same thing multiple times
  3. Visualizing the distribution of one variable
  4. Working with continuous variables
Вопрос 19

Which of the following measures would be most appropriate for describing the spread of a variable that is extremely right-skewed?

  1. Standard Deviation
  2. Range
  3. Variance
  4. Mode
Вопрос 20Ответ открыт бесплатно

Which of the following measures would be most appropriate for describing the central tendency of a variable that is continuous and normally distributed?

  1. Variance
  2. Mean✓ Правильный ответ
  3. Median
  4. Mode
✓ Правильный ответ

Mean

Вопрос 21

When the values in a series do not have equal importance, we calculate the _______.

  1. Mode
  2. Weighted Mean
  3. Arithmetic Mean
  4. Quantitative Analysis
Вопрос 22

Which measure of central tendency includes the magnitude of scores?

  1. Range
  2. Mean
  3. Mode
  4. Median
Вопрос 23Ответ открыт бесплатно

Which of the following is not a disadvantage of using mean?

  1. It is affected by extreme values
  2. It does not possess the desired algebraic property✓ Правильный ответ
  3. It cannot be computed in grouped data with open-ended class intervals
  4. It is affected by extreme scores
✓ Правильный ответ

It does not possess the desired algebraic property

Вопрос 24

_________ is not a measure of central tendency.

  1. Median
  2. Mode
  3. Range
  4. Valid
Вопрос 25

Percentiles divide a series into ______

  1. Ten equal parts
  2. Hundred equal parts
  3. Twenty equal parts
  4. Fifty equal parts
Вопрос 26Ответ открыт бесплатно

Which of the following diagrams is used to find the value of mode graphically?

  1. Pie Chart
  2. Histogram✓ Правильный ответ
  3. Bar Graphs
  4. Box Plot Graphs
✓ Правильный ответ

Histogram

Вопрос 27

The _____ for a set of scores can be obtained by using the formula X75 – X25

  1. range
  2. interquartile range
  3. median
  4. semi-interquartile range
Вопрос 28

You have collected a set of scores from participants performing a reaction time task. You decide that the most appropriate measure of central tendency for the scores is the median. The most appropriate measures of variability would thus be the

  1. SIQR semi inter-quartile range
  2. Standard deviation
  3. Sample variance
  4. range
Вопрос 29

Process that expands the range of intensity levels in image is called

  1. Linear stretching
  2. Elastic stretching
  3. Color stretching
  4. Contrast stretching
Вопрос 30Ответ открыт бесплатно

The shape of symmetrical distribution is _______

  1. U Shaped
  2. Circle
  3. Bell Shaped✓ Правильный ответ
  4. J Shaped
✓ Правильный ответ

Bell Shaped

Вопрос 31

The binomial distribution depends on which of the following?

  1. Mean and probability of success
  2. Sample size and probability of success
  3. Mean and standard deviation
  4. Standard deviation and number of successes
Вопрос 32

In a normal distribution, 95% of observations are

  1. within one standard deviation of the mean.
  2. within two standard deviations of the mean.
  3. included in computing the mean.
  4. divided by the sample size to get the standard deviation.
Вопрос 33Ответ открыт бесплатно

A sampling distribution shows

  1. the distribution of observations from a single sample.
  2. the distribution of scores in the population
  3. the distribution of sample sizes over time.
  4. the distribution of means from multiple samples.✓ Правильный ответ
✓ Правильный ответ

the distribution of means from multiple samples.

Вопрос 34

What is the probability that a ball is drawn at random from a jar?

  1. 0.5
  2. Cannot be determined from the given information
  3. 1
  4. Impossible
Вопрос 35

The multiplication law is potentially helpful when we are interested in computing the probability of

  1. The union of the two events
  2. The intersection of the two events
  3. Mutually exclusive events
  4. Cannot be determined with the information given
Вопрос 36Ответ открыт бесплатно

In a colony, there are 55 members. Every member posts a greeting card to all the members. How many greeting cards were posted by them?

  1. 990
  2. 890
  3. 1090
  4. 2970✓ Правильный ответ
✓ Правильный ответ

2970

Вопрос 37

Which one of these variables is a binomial random variable?

  1. Time it takes a randomly selected student to complete a multiple choice exam
  2. Number of textbooks a randomly selected student bought this term
  3. Number of women taller than 68 inches in a random sample of 5 women
  4. Number of CDs a randomly selected person owns
Вопрос 38

Which of the following is NOT an assumption of the Binomial distribution? __________"

  1. All trials must be independent.
  2. All trials are dependent on each other.
  3. Each trial must be classified as a success or a failure
  4. The number of successes in the trials is counted.
Вопрос 39

What does the r stand for in the binomial probability formula?

  1. Number of successes
  2. Number of trials
  3. Probability of failures
  4. Probability of successes
Вопрос 40Ответ открыт бесплатно

What does Poisson Distribution describe?

  1. Total number of events
  2. Rare events✓ Правильный ответ
  3. Future events
  4. The union of m and g
✓ Правильный ответ

Rare events

Вопрос 41

A course is being rated by students on a scale of 1 star to 5 stars. What is the level of measurement being used in this case?

  1. Ratio
  2. Ordinal
  3. Interval
  4. Nominal
Вопрос 42

Interval and Ratio types of data by nature are:

  1. Ordinal
  2. Qualitative variable
  3. Qualitative
  4. Quantitative
Вопрос 43Ответ открыт бесплатно

One column in a data table is the gender of the employee (e.g. Male, Female, Undefined). What level of measurement is used here?

  1. Ordinal
  2. Nominal✓ Правильный ответ
  3. Ratio
  4. Interval
✓ Правильный ответ

Nominal

Вопрос 44

A slippery-slope pattern of argument is fallacious when... One column in a data table is the daily temperature in degrees Celsius.

  1. Interval
  2. Ordinal
  3. Nominal
  4. Ratio
Вопрос 45

Participant observation is ______________ .

  1. When a researcher watches a group but does not get involved of the activities of a group to be researched.
  2. When the researcher examines a group and also participates in the activities as a member of the group to be researched.
  3. When the researcher asks respondents to record answers in writing from a list of questions in an observatory.
  4. When a researcher watches a group but does not get involved of the activities of a group to be researched.
Вопрос 46Ответ открыт бесплатно

Which of the following aspects is an advantage of closed questions?

  1. They provide in-depth information
  2. Not sufficiently similar in relevant ways✓ Правильный ответ
  3. There is a less chance of investigator bias
  4. They are easier to analyze
✓ Правильный ответ

Not sufficiently similar in relevant ways

Вопрос 47

The quality of data depends on the wording of questions. Which of the following should be used when formulating effective questions?

  1. Division Use of ambiguous questions
  2. Use of everyday language
  3. Use of scientific language
  4. Use of double-barreled questions
Вопрос 48

How much money do you spend on cigarettes each week?’ This is an example of a __________ question.

  1. Rhetorical
  2. Presumptuous question
  3. Doube-baralled
  4. Quantitative
Вопрос 49

Which of the following sampling methods, which is a probability method?

  1. Judgement
  2. Quota
  3. Convenience
  4. Simple random
Вопрос 50Ответ открыт бесплатно

Which of the following is not a type of non-probability sampling?

  1. Quota sampling
  2. Stratified random sampling✓ Правильный ответ
  3. Snowball sampling
  4. Convenience sampling
✓ Правильный ответ

Stratified random sampling

Вопрос 51

According to what theory does the proposition “X causes Y” mean that an intervention to change the value or probability distribution of X will change the value or probability distribution of Y?

  1. Conjunctive theory of causation
  2. Interventionist theory of causation
  3. Generative transmission theory of causation
  4. Symbiotic theory of causation
Вопрос 52

Sample is regarded as a subset of?

  1. popultion
  2. data
  3. set
  4. distribution
Вопрос 53Ответ открыт бесплатно

The difference between the expected value of a statistic and the value of the parameter being estimated is called a:

  1. Standard error
  2. Bias✓ Правильный ответ
  3. Sampling error
  4. non sampling error
✓ Правильный ответ

Bias

Вопрос 54

A 95% confidence interval for the mean of a population is such that

  1. There is a 95% chance that it contains the standard deviation of the population
  2. It contains 95% of the values in the population
  3. There is a 95% chance that it contains the mean of the population
  4. There is a 95% chance that it contains all the values in the population
Вопрос 55

Estimates given in the form of confidence intervals are called

  1. Points estimates
  2. Interval estimates
  3. Confidence limits
  4. Degrees of freedom
Вопрос 56Ответ открыт бесплатно

A confidence interval will be widened if

  1. The confidence level is decreased and the sample size is increased
  2. The confidence level is increased and the sample size is increased
  3. The confidence level is increased and the sample size is reduced✓ Правильный ответ
  4. The confidence level is decreased and the sample size is decreased
✓ Правильный ответ

The confidence level is increased and the sample size is reduced

Вопрос 57

By decreasing the sample size, the confidence interval becomes

  1. narrower
  2. wider
  3. fixed
  4. infinity
Вопрос 58

(1 - a) is called

  1. Level of significance
  2. Critical value
  3. Interval estimate
  4. Level of confidence
Вопрос 59

The distance between an estimate and the estimated parameter is called

  1. Sampling error
  2. Error of estimation
  3. Standard error
  4. bias
Вопрос 60Ответ открыт бесплатно

The shape of the t-distribution depends upon the

  1. Sample size
  2. Degrees of freedom✓ Правильный ответ
  3. Parameters
  4. Population size
✓ Правильный ответ

Degrees of freedom

Вопрос 61

Which of the following is true for the coefficient of correlation?

  1. The coefficient of correlation is not dependent on the change of scale
  2. The coefficient of correlation is not dependent on both the change of scale and change of origin
  3. The coefficient of correlation is not dependent on the change of origin
Вопрос 62

If the values of two variables move in the same direction, ___________

  1. The correlation is said to be non-linear
  2. The correlation is said to be linear
  3. The correlation is said to be negative
  4. The correlation is said to be positive
Вопрос 63Ответ открыт бесплатно

What is the meaning of the testing of the hypothesis?

  1. It is a significant estimation of the problem
  2. It is a rule for acceptance or rejection of the hypothesis of the research problem✓ Правильный ответ
  3. It is a method of significant statement
  4. Unlikely
✓ Правильный ответ

It is a rule for acceptance or rejection of the hypothesis of the research problem

Вопрос 64

Which of the following statements is true about the type two error?

  1. Type two error means to reject a correct hypothesis
  2. Type two error means to accept an incorrect hypothesis
  3. Type two error means to reject an incorrect hypothesis
  4. Type two error means to accept a correct hypothesis
Вопрос 65

Which of the following statements is true about the correlational analysis between two sets of data?

  1. The correlational analysis between two sets of data is known as a simple correlation
  2. The correlation analysis between two sets of data is known as coefficient correlation
  3. The correlational analysis between two sets of data is known as multiple correlation
  4. The correlational analysis between two sets of data is known as partial correlation
Вопрос 66Ответ открыт бесплатно

The original hypothesis is known as ______.

  1. Alternative hypothesis
  2. Null hypothesis✓ Правильный ответ
  3. Simple hypothesis
  4. Estimation
✓ Правильный ответ

Null hypothesis

Вопрос 67

Which of the following techniques is an analysis of the relationship between two variables to help provide the prediction mechanism?

  1. Standard error
  2. regression
  3. correlation
  4. unknown
Вопрос 68

What is the meaning of the testing of the hypothesis?

  1. It is a significant estimation of the problem
  2. It is a rule for acceptance or rejection of the hypothesis of the research problem
  3. It is a method of making a significant statement
  4. Regression and estimation
Вопрос 69

Which of the following statements is true about the null hypothesis?

  1. Any wrong decision related to the null hypothesis results in one type of an error
  2. Any wrong decision related to the null hypothesis results in two type of an error
  3. Any wrong decision related to the null hypothesis results in four types of errors
  4. Any wrong decision related to the null hypothesis results in three types of errors
Вопрос 70Ответ открыт бесплатно

The independent variable is used to explain the dependent variable in ________.

  1. Non linear regression
  2. Linear regression analysis✓ Правильный ответ
  3. Multiple regression analysis
  4. Not stable regression
✓ Правильный ответ

Linear regression analysis

Вопрос 71

In regression analysis, the variable that is being predicted is

  1. The dependent variable
  2. Usually denoted by x
  3. The independent variable
  4. Usually denoted by r
Вопрос 72

Least square method calculates the best-fitting line for the observed data by minimizing the sum of the squares of the _______ deviations.

  1. Vertical
  2. Horizontal
  3. Vertical and horizontal both
  4. Not vertical and horizontal
Вопрос 73Ответ открыт бесплатно

The standard deviation is to the mean as the ____________ is to the regression line

  1. Z-score
  2. Standard error of the estimate✓ Правильный ответ
  3. SSR
  4. coefficient of determination
✓ Правильный ответ

Standard error of the estimate

Вопрос 74

A residual is defined as

  1. The difference between the actual Y values and the predicted Y values.
  2. The difference between the actual Y values and the mean of Y
  3. The predicted value of Y for the average X value
  4. The square root of the slope
Вопрос 75

A measure of goodness of fit for the estimated regression equation is the

  1. Correlation
  2. Mean square to determination
  3. Multiple coefficient of determination
  4. Mean square due to error
Вопрос 76Ответ открыт бесплатно

If a regression coefficient is less than 1 then the other should be?

  1. Equal to 1
  2. Greater than 1✓ Правильный ответ
  3. Less than 1
  4. Zero
✓ Правильный ответ

Greater than 1

Вопрос 77

Negative autocorrelation can be indicated by which of the following?

  1. A cyclical pattern in the residuals
  2. All alternating pattern in the residuals
  3. Complete randomness in the residuals
  4. All of the residuals are close to zero
Вопрос 78

When measurement errors are present in the explanatory variable(s) they make

  1. Consistent estimation of model parameters low
  2. Consistent estimation of parameters impossible
  3. Consistent estimation of parameters high
  4. Consistent estimation of parameters complex
Вопрос 79

For the presence and absence of first-order autocorrelation valid tests are

  1. Park and Glejser test
  2. Autocorrelation
  3. White and Gold-Feld test
  4. Durbin-Watson d and Durbin h statistics
Вопрос 80Ответ открыт бесплатно

Choose a true statement about Durbin-Watson test

  1. DW means negative autocorrelation
  2. DW-test verifies autocorrelation only of the first order auto-regressive model✓ Правильный ответ
  3. DW-test verifies autocorrelation of any given order auto-regressive model
  4. The consequent
✓ Правильный ответ

DW-test verifies autocorrelation only of the first order auto-regressive model

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