Exam 15: Correlation

"The incidence of depression among college students is negatively correlated with the number of sunny days each year in the locale where they attend college." This statement means that:

In a re-analysis of published studies, Twenge and Im (2007) found that for the time period of 1958 to 2001, the need for social approval of people in the United States was positively correlated with changes in the Dow Jones Industrial Average during that same period (the correlation coefficient was 0.10).This means that:

A state transportation department is determining the safety of roadways in a locality based on the age of drivers and number of traffic accidents.The department calculates a Pearson correlation coefficient of 0.295.If the critical value for r = 0.330, what could be concluded?

Which of these values indicates the strongest relationship between two variables?

According to guidelines published by Cohen (1988), a correlation value of 0.29 would be considered:

If two variables are negatively correlated, then low scores on one variable would be associated with low scores on the other variable.

What kind of correlation would one expect to find between the age of a car (nonclassic) and its value?

The first step involved in calculating the Pearson correlation coefficient is to:

Using the Pearson correlation coefficient to analyze the relationship between two variables is only appropriate if the variables are:

Correlation coefficients at or near 0.00 are considered perfect correlations.

Which of these is a reason why cause and effect is NOT assumed in correlational studies?

If two variables are positively correlated, then high scores on one variable would be associated with high scores on the other variable.

Use the following to answer question Nietfeld and Ender (2003) performed a study investigating the relation between the intelligence of student teachers and their efficacy in the classroom.This relation is depicted in the scatterplot, which shows fictional data that replicate the pattern of performance observed by the researchers. Figure: Teaching Efficacy -(Figure: Teaching Efficacy) Based on the scatterplot, what kind of relation between intelligence and teaching efficacy did Nietfeld and Ender find?

If two variables are negatively correlated, then high scores on one variable would be associated with low scores on the other variable.

If a test actually measures what it is intended to measure, then that test is:

What is the research hypothesis when testing for significance using the Pearson correlation coefficient?

The strength or size of a correlation coefficient is dependent on its sign.

According to guidelines published by Cohen (1988), a correlation value of -0.55 would be considered:

The correlation coefficient between class attendance and number of problems missed on an exam is -0.77.Which statement regarding this finding is correct?

Before starting the calculations of a correlation, one should: