Stats Chapter 15

The correlation coefficient is a measure of __________.

Association

A significant correlation indicates a meaningful relationship exists between the two variables in the analysis.

False

The correlation coefficient can only be used for two-tailed tests.

False

What is another term for a negative correlation?

Indirect

What does the statement represent?

Research hypothesis

What is the name of the Greek letter ρ?

Rho

This chapter illustrates that you can also incorporate ___________ into the correlation coefficient.

Statistical significance

While you can use the correlation coefficient as its own test statistic, what is the other appropriate test statistic often used to examine the significance of a correlation?

T-test

In the case of the correlation coefficient, the appropriate test statistics to use is the _________________.

T-test for the correlation coefficient

The correlation coefficient examines ___________________.

The relationship between two variables

Correlation coefficients examine:

The relationship between variables

Which of the following Greek symbols is used to represent the population estimate for a correlation coefficient?

p

Which of the following results is significant at the .05 level (two-tailed test)?

r(10)=.59

Which of the following results is significant at the .01 level (one-tailed test)?

r(30)=.42

If a simple Pearson correlation value = .512, what percentage of variance is accounted for?

26%

In the equation r(65) = .45, p < .05, what are the degrees of freedom?

65

If the correlation between two variables is .496, how much of the variance has not been accounted for?

75.4%

What is the most important characteristic of a correlation coefficient?

Absolute value

In the formula for calculating degrees of freedom for a correlation coefficient, what does the n represent?

Number of pairs

Correlation coefficients can test this many variables at a time:

Only two

A significant correlation between two variables does not imply that one variable causes the other.

True

If a research hypothesis does not predict the direction of a relationship, the test is __________.

Two-tailed