Question 1

A special mathematical procedure for predicting scores on one variable (criterion or Y)given a score on another (predictor or X)is:

Accepted Answer

linear regression

Question 2

A ________ is a graph that visually displays the relationship between two variables.

Accepted Answer

scatterplot

Question 3

In a normal distribution,what percentage of scores will fall between one standard deviation below the mean and one standard deviation above the mean?

Accepted Answer

68%

Question 4

The appropriate correlation coefficient to use when one variable is dichotomous and one is measured on an interval or ratio scale is:

Accepted Answer

Point-Biserial Correlation

Question 5

If the coefficient of determination is 0.30 what is the coefficient of non-determination?

Accepted Answer

070

Question 6

According to the guidelines presented in the text,a correlation of .25 would be considered:

Accepted Answer

we ak

Question 7

Coefficients based on samples with ________ variances will generally produce _______ correlation coefficients than those based on samples with ________ variances.

Accepted Answer

Large; higher; small

Question 8

The correlation between two variables is 0.70.Using the concept of the coefficient of nondetermination,the proportion of variance that is NOT determined or predictable from the relationship between the two variables is:

Accepted Answer

51%

Question 9

Why would a psychologist feel that the variance might be difficult to interpret?

Accepted Answer

It uses squared raw score units

Question 10

If you want to calculate the correlation between spelling skills and reading comprehension which are both reported as percentile ranks,the appropriate coefficient is:

Accepted Answer

Spearman Rank-Difference Correlation

Question 11

Assume a correlation between two tests is 0.40 (r = 0.40).What would the coefficient of determination equal?

Accepted Answer

016

Question 12

If the range of one or both variables is restricted,the resulting correlation coefficient will likely:

Accepted Answer

be decreased

Question 13

If the correlation between math and writing achievement scores in the general population is 0.40,the correlation between these scores among students at MIT,Yale,and Stanford (selective and prestigious universities)would likely be:

Accepted Answer

less than 040

Question 14

If a large decrease on one variable is associated with a correspondingly large increase on another variable,the correlation is likely:

Accepted Answer

Strong and negative

Question 15

The correlation between two variables is 0.70.Using the concept of the coefficient of determination,the proportion of variance that is determined or predictable from the relationship between the two measures is:

Accepted Answer

49%

Question 16

What is the range of the data below? 
8 10 12 14 16 18 20 22

Accepted Answer

14

Quiz 2: The Basics Statistics of Measurement

A special mathematical procedure for predicting scores on one variable (criterion or Y) given a score on another (predictor or X) is: