Question 1

The relationship between a sample's correlation coefficient and the population correlation ( ρ\rhoρ ,"rho") is

Accepted Answer

A)   analogous to the relationship between a sample mean and a population mean.
B)   such that the correlation coefficient provides an estimate of rho.
C)   such that the more sampling error there is for the correlation coefficient, the wider the confidence interval for rho.
D)   all of these

Question 2

Which of the following is not a major stage of data analysis?

Accepted Answer

A)   getting to know the data
B)   confirming what the data reveal
C)   transforming the data
D)   summarizing the data

Question 3

The _________ the value of the estimated standard error of the mean,the _________ our estimate of the population mean.

Accepted Answer

A)   larger; better
B)   larger; higher
C)   smaller; better
D)   smaller; lower

Question 4

An advantage of a stem-and-leaf display is that

Accepted Answer

A)   it is a graph of the mean, median, and mode.
B)   it reveals whether the relationship between two variables is linear.
C)   it reveals the shape of a distribution and the presence of any outliers.
D)   the intervals tells us how well our sample mean estimates the population mean.

Question 5

The value that splits a frequency distribution into two halves,each half with the same number of values,is the

Accepted Answer

A)   mode.
B)   mean.
C)   median.
D)   standard deviation.

Question 6

The "margin of error" typically reported for survey results estimates the difference between the sample results and the population values due to

Accepted Answer

A)   computer calculations.
B)   differences among survey methods.
C)   chance or random factors.
D)   survey results.

Question 7

One important reason for displaying correlational data in a scatterplot prior to computing a correlation coefficient is to make sure

Accepted Answer

A)   the relationship between the variables is linear.
B)   the means for the two variables are the same.
C)   the x- and y-axis for each variable has appropriate endpoints.
D)   the causal variable is graphed on the x-axis.

Question 8

When interpreting confidence intervals when there are three or more means,if the intervals do not overlap,we have evidence that

Accepted Answer

A)   the differences among population means are inconclusive.
B)   the population means differ.
C)   the range of values for each interval is extreme.
D)   the sample means do not differ.

Question 9

When two variables are correlated,our ability to make ___________ increases.

Accepted Answer

A)   causal inferences for these variables
B)   predictions about a third variable
C)   predictions for these variables
D)   causal inferences about a third variable

Question 10

Describe the advantages and disadvantages of the three measures of central tendency: mean,median,mode.

Accepted Answer

The mean is the most commonly used measu...

Question 11

A coherent "story" of data analysis for a study will include

Accepted Answer

A)   an explanation of the findings.
B)   counter arguments for opposing interpretations of the findings.
C)   justifications for conclusions.
D)   all of these

Question 12

A researcher tests a sample of first-grade children for a school district to help the district identify areas in which the curriculum should be changed.The measure is a valid and reliable measure of intelligence.The researcher estimates the population mean for the intelligence scores and observes a large value for the standard error of the mean.The best thing the researcher could do to improve the estimate is

Accepted Answer

A)   test children in a different, more heterogeneous school district.
B)   compute a confidence interval.
C)   change the testing procedures to increase the variability of the test scores.
D)   increase the sample size of children tested.

Question 13

A major approach to "confirming what the data reveal" is the calculation of

Accepted Answer

A)   standard deviations.
B)   stem-and-leaf displays.
C)   measures of central tendency.
D)   confidence intervals for a population parameter.

Question 14

The ____________ is the best measure of central tendency when there are extreme values in the distribution.

Accepted Answer

A)   mode
B)   median
C)   mean
D)   variance

Question 15

A negative correlation indicates that as values for one measure ___________,the values for the other measure ____________.

Accepted Answer

A)   decrease; remain constant
B)   increase; remain constant
C)   increase; decrease
D)   increase; increase

Question 16

Distributions of scores for two groups in an experiment can be compared by

Accepted Answer

A)   arranging the "stems" for both groups in one stem-and-leaf display and the "leaves" for both groups in a second stem-and-leaf display.
B)   preparing one stem-and-leaf display using the scores for both groups.
C)   arranging a stem-and-leaf display for each group side-by-side.
D)   none of these

Question 17

Which of the following indicates the strongest correlation?

Accepted Answer

A)   -.80
B)   0.00
C)   +.25
D)   +.75

Question 18

Having calculated a 95% confidence interval for a single population mean we may state that the odds are 95/100 that the

Accepted Answer

A)   population mean equals 95.
B)   sample mean is the same as the population mean.
C)   obtained interval contains the population mean.
D)   population mean falls in the interval.

Question 19

The direction (positive or negative) of a correlation is indicated by

Accepted Answer

A)   the sign of the coefficient.
B)   numbers between 0.0 and 1.00.
C)   the absolute value of the correlation.
D)   our ability to make predictions for the variables.

Question 20

A correlation coefficient is a ________ summary of the degree of relationship between two sets of scores.

Accepted Answer

A)   subjective
B)   qualitative
C)   quantitative
D)   graphical

Exam 11: Data Analysis and Interpretation: Part Idescribing Data, confidence Intervals, correlation

The relationship between a sample's correlation coefficient and the population correlation ( $\rho$ ,"rho") is

Correct Answer
verified

The "margin of error" typically reported for survey results estimates the difference between the sample results and the population values due to

Correct Answer
verified

The ____________ is the best measure of central tendency when there are extreme values in the distribution.

Correct Answer
verified

A coherent "story" of data analysis for a study will include

Correct Answer
verified

When two variables are correlated,our ability to make ___________ increases.

Correct Answer
verified

Describe the advantages and disadvantages of the three measures of central tendency: mean,median,mode.

Correct Answer
verified
The mean is the most commonly used measu...
View Answer

The value that splits a frequency distribution into two halves,each half with the same number of values,is the

Correct Answer
verified

Which of the following indicates the strongest correlation?

Correct Answer
verified

A major approach to "confirming what the data reveal" is the calculation of

Correct Answer
verified

Correct Answer
verified

When interpreting confidence intervals when there are three or more means,if the intervals do not overlap,we have evidence that

Correct Answer
verified

Distributions of scores for two groups in an experiment can be compared by

Correct Answer
verified

A negative correlation indicates that as values for one measure _,the values for the other measure __.

Correct Answer
verified

One important reason for displaying correlational data in a scatterplot prior to computing a correlation coefficient is to make sure

Correct Answer
verified

Having calculated a 95% confidence interval for a single population mean we may state that the odds are 95/100 that the

Correct Answer
verified

A correlation coefficient is a ________ summary of the degree of relationship between two sets of scores.

Correct Answer
verified

The _ the value of the estimated standard error of the mean,the _ our estimate of the population mean.

Correct Answer
verified

The direction (positive or negative) of a correlation is indicated by

Correct Answer
verified

Which of the following is not a major stage of data analysis?

Correct Answer
verified

An advantage of a stem-and-leaf display is that

Correct Answer
verified

Exam 11: Data Analysis and Interpretation: Part Idescribing Data, confidence Intervals, correlation

The relationship between a sample's correlation coefficient and the population correlation ( ρ\rhoρ ,"rho") is

Correct AnswerverifiedShow Answer

The "margin of error" typically reported for survey results estimates the difference between the sample results and the population values due to

Correct AnswerverifiedShow Answer

The ____________ is the best measure of central tendency when there are extreme values in the distribution.

Correct AnswerverifiedShow Answer

A coherent "story" of data analysis for a study will include

Correct AnswerverifiedShow Answer

When two variables are correlated,our ability to make ___________ increases.

Correct AnswerverifiedShow Answer

Describe the advantages and disadvantages of the three measures of central tendency: mean,median,mode.

Correct AnswerverifiedThe mean is the most commonly used measu...View AnswerShow Answer

The value that splits a frequency distribution into two halves,each half with the same number of values,is the

Correct AnswerverifiedShow Answer

Which of the following indicates the strongest correlation?

Correct AnswerverifiedShow Answer

A major approach to "confirming what the data reveal" is the calculation of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When interpreting confidence intervals when there are three or more means,if the intervals do not overlap,we have evidence that

Correct AnswerverifiedShow Answer

Distributions of scores for two groups in an experiment can be compared by

Correct AnswerverifiedShow Answer

A negative correlation indicates that as values for one measure ___________,the values for the other measure ____________.

Correct AnswerverifiedShow Answer

One important reason for displaying correlational data in a scatterplot prior to computing a correlation coefficient is to make sure

Correct AnswerverifiedShow Answer

Having calculated a 95% confidence interval for a single population mean we may state that the odds are 95/100 that the

Correct AnswerverifiedShow Answer

A correlation coefficient is a ________ summary of the degree of relationship between two sets of scores.

Correct AnswerverifiedShow Answer

The _________ the value of the estimated standard error of the mean,the _________ our estimate of the population mean.

Correct AnswerverifiedShow Answer

The direction (positive or negative) of a correlation is indicated by

Correct AnswerverifiedShow Answer

Which of the following is not a major stage of data analysis?

Correct AnswerverifiedShow Answer

An advantage of a stem-and-leaf display is that

Correct AnswerverifiedShow Answer

The relationship between a sample's correlation coefficient and the population correlation ( $\rho$ ,"rho") is

Correct Answer
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Correct Answer
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Correct Answer
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The mean is the most commonly used measu...
View Answer

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Correct Answer
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Correct Answer
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Correct Answer
verified

A negative correlation indicates that as values for one measure _,the values for the other measure __.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

The _ the value of the estimated standard error of the mean,the _ our estimate of the population mean.

Correct Answer
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verified

Correct Answer
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Correct Answer
verified