Question 1

Restricting the range of either X or Y will generally lower the correlation between the variables.

Accepted Answer

A) True 
 B)False

Question 2

Why is r 2 a useful statistic?

Accepted Answer

R-squared (R²) is a useful statistic in

Question 3

A teacher was interested in knowing if leadership ability was correlated with attractiveness in third graders. The teacher ranked a group of students for leadership ability and had another teacher rank the same children on attractiveness.

Accepted Answer

The answer of A teacher was interested in knowing if...

Question 4

The phone rings and the President is calling you. He says, "I hear you are studying correlation. Can you please tell me how much of the variability of my popularity rating is explained by the inflation rate?" He kindly supplies you with the following data:   Please furnish the President with the information he desires.

Accepted Answer

The answer of The phone rings and the President is...

Question 5

Pearson r can be properly used on which of the following type(s) of relationships?

Accepted Answer

A)  linear 
B)  curvilinear 
C)  exponential 
D)  all of these 
A)  linear 
B)  curvilinear 
C)  exponential 
D)  all of these

Question 6

The farther away the points on a scatter diagram fall from the regression line, the lower the correlation.

Accepted Answer

A) True 
 B)False

Question 7

Given the following set of data for 8 subjects:

Accepted Answer

The answer of Given the following set of data for...

Question 8

Which of the following is (are) not correlation coefficients?

Accepted Answer

A)  Pearson r 
B)  eta 
C)  rho 
D)  phi 
E)  they all are correlation coefficients 
A)  Pearson r 
B)  eta 
C)  rho 
D)  phi 
E)  they all are correlation coefficients

Question 9

A traffic safety officer conducted an experiment to determine whether there is a correlation between people's ages and driving speeds. Six individuals were randomly sampled and the following data were collected.   The proportion of variability of Y accounted for by X is _________.

Accepted Answer

A)  0.49 
B)  0.67 
C)  0.40 
D)  - 0.49 
A)  0.49 
B)  0.67 
C)  0.40 
D)  - 0.49

Question 10

What factors influence the choice of whether to use a particular correlation coefficient?

Accepted Answer

There are several factors that can influ

Question 11

Y can be most accurately predicted from X if the correlation between X and Y is _________.

Accepted Answer

A)  0.80 
B)  0.00 
C)  0.45 
D)  - 0.98 
A)  0.80 
B)  0.00 
C)  0.45 
D)  - 0.98

Question 12

Define slope.

Accepted Answer

The slope of a line in a two-dimensional

Question 13

Define direct relationship.

Accepted Answer

A direct relationship refers to a connec

Question 14

If the relationship is imperfect, the value of the correlation coefficient must be negative.

Accepted Answer

A) True 
 B)False

Question 15

When a correlation exists, lowering the range of either of the variables will _________.

Accepted Answer

A)  raise the correlation 
B)  lower the correlation 
C)  not change the correlation 
D)  produce a causal relationship 
A)  raise the correlation 
B)  lower the correlation 
C)  not change the correlation 
D)  produce a causal relationship

Question 16

Correlation implies causation.

Accepted Answer

A) True 
 B)False

Question 17

Which Pearson correlation coefficient shows the strongest relationship between two variables?

Accepted Answer

A)  - 0.80 
B)  0.00 
C)  0.75 
D)  0.20 
E)  0.03 
A)  - 0.80 
B)  0.00 
C)  0.75 
D)  0.20 
E)  0.03

Question 18

Causation implies correlation.

Accepted Answer

A) True 
 B)False

Question 19

The correlation coefficient r is a descriptive statistic.

Accepted Answer

A) True 
 B)False

Question 20

In order to compute r , we must first convert each score to its z score and then do our calculations with the z scores.

Accepted Answer

A) True 
 B)False

Restricting the range of either X or Y will generally lower the correlation between the variables.

Why is r 2 a useful statistic?

A teacher was interested in knowing if leadership ability was correlated with attractiveness in third graders. The teacher ranked a group of students for leadership ability and had another teacher rank the same children on attractiveness.

Pearson r can be properly used on which of the following type(s) of relationships?

The farther away the points on a scatter diagram fall from the regression line, the lower the correlation.

Given the following set of data for 8 subjects:

Which of the following is (are) not correlation coefficients?

A traffic safety officer conducted an experiment to determine whether there is a correlation between people's ages and driving speeds. Six individuals were randomly sampled and the following data were collected. The proportion of variability of Y accounted for by X is _________.

What factors influence the choice of whether to use a particular correlation coefficient?

Y can be most accurately predicted from X if the correlation between X and Y is _________.

Define slope.

Define direct relationship.

If the relationship is imperfect, the value of the correlation coefficient must be negative.

When a correlation exists, lowering the range of either of the variables will _________.

Correlation implies causation.

Which Pearson correlation coefficient shows the strongest relationship between two variables?

Causation implies correlation.

The correlation coefficient r is a descriptive statistic.

In order to compute r , we must first convert each score to its z score and then do our calculations with the z scores.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

Exam 6: Correlation

Restricting the range of either X or Y will generally lower the correlation between the variables.

Why is r 2 a useful statistic?

A teacher was interested in knowing if leadership ability was correlated with attractiveness in third graders. The teacher ranked a group of students for leadership ability and had another teacher rank the same children on attractiveness.

Pearson r can be properly used on which of the following type(s) of relationships?

The farther away the points on a scatter diagram fall from the regression line, the lower the correlation.

Given the following set of data for 8 subjects:

Which of the following is (are) not correlation coefficients?

A traffic safety officer conducted an experiment to determine whether there is a correlation between people's ages and driving speeds. Six individuals were randomly sampled and the following data were collected. The proportion of variability of Y accounted for by X is _________.

What factors influence the choice of whether to use a particular correlation coefficient?

Y can be most accurately predicted from X if the correlation between X and Y is _________.

Define slope.

Define direct relationship.

If the relationship is imperfect, the value of the correlation coefficient must be negative.

When a correlation exists, lowering the range of either of the variables will _________.

Correlation implies causation.

Which Pearson correlation coefficient shows the strongest relationship between two variables?

Causation implies correlation.

The correlation coefficient r is a descriptive statistic.

In order to compute r , we must first convert each score to its z score and then do our calculations with the z scores.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Single Samples

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters