Exam 6: An Introduction to Correlation and Regression

The coefficient of determination explains

__________________ correlation measures the strength of a relationship between two continuous variables.

Variables may be analyzed and studied long after the data have been gathered.Such data are known as _______ data.

A consumer psychologist wants to know if shoe size and weight are correlated in adult males. She measures the shoe size and asks the weight of 14 consecutive customers. They are as follows: size 9, 176 lbs.; size 7.5, 141 lbs.; size 10, 185 lbs.; size 12, 202 lbs.; size 9.5, 174 lbs.; size 10, 150 lbs.; size 10, 193 lbs.; size 10.5, 237 lbs.; size 13, 248 lbs.; size 8, 159 lbs.; size 8.5, 136 lbs.; size 9.5, 174 lbs.; size 9, 172 lbs.; and size 11, 183 lbs. -The r value can be reported significant (lowest possible) at p

In the study of 30 pairs of scores in a Pearson correlation, what are the degrees of freedom?

The ____________ correlation gives an estimate of the degree of relationship between two dichotomous variables.

In multiple regression, the coefficient R can be interpreted as

In multiple regression, the R-square can be interpreted as

A consumer psychologist wants to know if shoe size and weight are correlated in adult males. She measures the shoe size and asks the weight of 14 consecutive customers. They are as follows: size 9, 176 lbs.; size 7.5, 141 lbs.; size 10, 185 lbs.; size 12, 202 lbs.; size 9.5, 174 lbs.; size 10, 150 lbs.; size 10, 193 lbs.; size 10.5, 237 lbs.; size 13, 248 lbs.; size 8, 159 lbs.; size 8.5, 136 lbs.; size 9.5, 174 lbs.; size 9, 172 lbs.; and size 11, 183 lbs. -The df for this problem are

To test for the significance of the phi correlation, one must use the ________________ distribution.

Abelson's first law of statistics is

Milk has been found to be positively correlated to cancer because

A ________________ is a graphic representation of the pairs of scores plotted along the x- and y-axes in a correlation coefficient.

A Pearson correlation above r +.50 may be labeled

The ____________ assumption is met if, in a scatterplot, the distance from the points to the line is relatively equal all along the line.

The interest in _______________ analysis is seeing how various values of the independent variable predict corresponding values in the dependent variable.

The formula for Spearman's rank-order correlation was actually derived by

Given a strong negative correlation, a score that is relatively high on variable x will be relatively _____ on variable y.

The strength of a relationship between two variables in correlation is ________________ of the significance testing.

A consumer psychologist wants to know if shoe size and weight are correlated in adult males. She measures the shoe size and asks the weight of 14 consecutive customers. They are as follows: size 9, 176 lbs.; size 7.5, 141 lbs.; size 10, 185 lbs.; size 12, 202 lbs.; size 9.5, 174 lbs.; size 10, 150 lbs.; size 10, 193 lbs.; size 10.5, 237 lbs.; size 13, 248 lbs.; size 8, 159 lbs.; size 8.5, 136 lbs.; size 9.5, 174 lbs.; size 9, 172 lbs.; and size 11, 183 lbs. -The coefficient of determination for this problem is