Question 1

A monotonic relationship is one in which a functional relationship changes direction several times.

Accepted Answer

A) True 
 B)False  False

Question 2

The horizontal axis of a graph is called the _____.

Accepted Answer

A)   abscissa or x-axis
B)   abscissa or y-axis
C)   ordinate or x-axis
D)   ordinate or y-axisE) A) and B)
F) A) and C)

Question 3

The best-fitting straight line on a scatter plot that minimizes the sum of the squared deviations of each data point from the line is called the:

Accepted Answer

A)   standard error line.
B)   optimal line.
C)   least-squares regression line.
D)   None of the answers is correct.E) C) and D)
F) B) and D)

Question 4

The _____ provides an estimate of the amount of error in prediction.

Accepted Answer

A)   standard deviation
B)   variance
C)   regression weight
D)   standard error of estimateE) A) and B)
F) None of the above

Question 5

The most popular measure of spread is the:

Accepted Answer

A)   standard deviation.
B)   variance.
C)   interquartile range.
D)   range.E) B) and D)
F) A) and D)

Question 6

Organization of data depends on the research design, the number of variables that were observed and recorded, and how observations were grouped or subdivided.

Accepted Answer

A) True 
 B)False  True

Question 7

Dummy coding involves:

Accepted Answer

A)   assignment of numbers to the levels of a qualitative independent variable.
B)   creating new variables based on the values of the old ones.
C)   categorizing dependent variables according to their magnitudes.
D)   None of the answers is correct.E) A) and B)
F) C) and D)

Question 8

Compare and contrast the use of grouped data versus individual scores when evaluating results. What are the strengths and limitations of each?

Accepted Answer

Grouped data and individual scores are b...

Question 9

A curve that represents a uniformly increasing or decreasing function is said to be:

Accepted Answer

A)   monotonic.
B)   nonmonotonic.
C)   cubic.
D)   asymptotic.E) B) and C)
F) A) and C)

Question 10

Why is it a good idea to explore your data using EDA techniques before you conduct any statistical tests?

Accepted Answer

A)   They help spot serious defects in your data that may warrant taking corrective action before you proceed to the inferential analysis.
B)   They can help you determine which summary statistics would be appropriate for a given set of data.
C)   They may reveal unsuspected influences.
D)   All of the answers are correct.E) C) and D)
F) B) and D) D

Question 11

A set of mutually exclusive categories (classes)  together with a count of the number of data values falling into each category is termed a:

Accepted Answer

A)   sorted list.
B)   cumulative distribution.
C)   frequency distribution.
D)   scatter plot.E) A) and B)
F) None of the above

Question 12

In a positively skewed distribution, the mean:

Accepted Answer

A)   underestimates the center.
B)   overestimates the center.
C)   is as accurate a measure of the center as is the median.
D)   accurately represents central tendency.E) A) and B)
F) All of the above

Question 13

If data are scaled on an interval or ratio scale, the mean becomes a less representative measure of center when:

Accepted Answer

A)   there are more than 10 scores in a distribution.
B)   there are less than 5 scores in a distribution.
C)   the mean and median are equal.
D)   the distribution of scores is strongly skewed.E) All of the above
F) C) and D)

Question 14

For quantitative data (e.g., the number of milligrams of a drug) , coding your data involves:

Accepted Answer

A)   dummy coding.
B)   transferring each subject's score to a computer coding sheet.
C)   assigning numeric values to categorical data.
D)   None of the answers is correct.E) All of the above
F) B) and D)

Question 15

A correlation matrix results when you:

Accepted Answer

A)   compute all possible correlations among a number of variables.
B)   enter your scores into a linear regression analysis.
C)   compute beta weights for all your variables.
D)   None of the answers is correct.E) None of the above
F) A) and B)

Question 16

The Spearman rank-order correlation is used when:

Accepted Answer

A)   dependent variables are scaled on a ratio scale.
B)   one variable being measured is on an interval scale and the other being measured is on a nominal scale.
C)   both of the variables being correlated are measured on a dichotomous scale.
D)   one wants to determine whether the relationship between variables is monotonic.E) B) and D)
F) All of the above

Question 17

When a curve levels off at some maximum or minimum value, the function is said to be _____ at that value.

Accepted Answer

A)   nonlinear
B)   nonmonotonic
C)   positively accelerated
D)   asymptoticE) B) and D)
F) C) and D)

Question 18

The Pearson r is insensitive to the shapes of the score distributions.

Accepted Answer

A) True 
 B)False

Question 19

A distribution contains the following scores: 1, 1, 2, 2, 2, 3, 3, 4, 4, 5. Its mode is:

Accepted Answer

A)   5.
B)   3.
C)   2.
D)   4.E) All of the above
F) B) and D)

Question 20

For data measured on a nominal scale, you are limited to using the _____ as your measure of center.

Accepted Answer

A)   mean
B)   mode
C)   median
D)   All of the answers are correct.E) C) and D)
F) A) and D)

Exam 13: Describing Data

A monotonic relationship is one in which a functional relationship changes direction several times.

Correct AnswerverifiedFalse

The horizontal axis of a graph is called the _____.

Correct AnswerverifiedShow Answer

The best-fitting straight line on a scatter plot that minimizes the sum of the squared deviations of each data point from the line is called the:

Correct AnswerverifiedShow Answer

The _____ provides an estimate of the amount of error in prediction.

Correct AnswerverifiedShow Answer

The most popular measure of spread is the:

Correct AnswerverifiedShow Answer

Organization of data depends on the research design, the number of variables that were observed and recorded, and how observations were grouped or subdivided.

Correct AnswerverifiedTrue

Dummy coding involves:

Correct AnswerverifiedShow Answer

Compare and contrast the use of grouped data versus individual scores when evaluating results. What are the strengths and limitations of each?

Correct AnswerAnswered by ExamLex AIGrouped data and individual scores are b...View AnswerShow Answer

A curve that represents a uniformly increasing or decreasing function is said to be:

Correct AnswerverifiedShow Answer

Why is it a good idea to explore your data using EDA techniques before you conduct any statistical tests?

Correct AnswerverifiedD

A set of mutually exclusive categories (classes) together with a count of the number of data values falling into each category is termed a:

Correct AnswerverifiedShow Answer

In a positively skewed distribution, the mean:

Correct AnswerverifiedShow Answer

If data are scaled on an interval or ratio scale, the mean becomes a less representative measure of center when:

Correct AnswerverifiedShow Answer

For quantitative data (e.g., the number of milligrams of a drug) , coding your data involves:

Correct AnswerverifiedShow Answer

A correlation matrix results when you:

Correct AnswerverifiedShow Answer

The Spearman rank-order correlation is used when:

Correct AnswerverifiedShow Answer

When a curve levels off at some maximum or minimum value, the function is said to be _____ at that value.

Correct AnswerverifiedShow Answer

The Pearson r is insensitive to the shapes of the score distributions.

Correct AnswerverifiedShow Answer

A distribution contains the following scores: 1, 1, 2, 2, 2, 3, 3, 4, 4, 5. Its mode is:

Correct AnswerverifiedShow Answer

For data measured on a nominal scale, you are limited to using the _____ as your measure of center.

Correct AnswerverifiedShow Answer

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False

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True

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Answered by ExamLex AI
Grouped data and individual scores are b...
View Answer

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D

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