A study finds a moderate positive relationship between measures of self-esteem and achievement for a groups of middle school students. Which of the following correlation coefficient would best represent this relationship?

Determine the kind of index of correlation appropriate for use in solving the following problem: What is the correlation coefficient between self-esteem and aptitude scores for a groups of students?

Determine the kind of index of correlation appropriate for use in solving the following problem: What is the relationship between socio-economic scores of a group of students and their academic rank in a high school class?

Determine the kind of index of correlation appropriate for use in solving the following problem: What is the correlation between gender and being hired or not hired for a job when you have 60 men and 60 women with identical scores on a qualifying test for the job?

2. For this class, the relationship between the amount of time spent studying and the amount of time spent socializing per week was examined. It was determined that the more hours they spent studying, the fewer hours they spent socializing. This is a negative association.

3. Two variables with a correlation of 0.3 have a stronger linear relationship than two variables with a correlation of -0.7.

4. It is possible for variables to have r = 0 but still have a strong association.

5. After polling a certain group of people, researchers found a 0.5 correlation between the number of car accidents per year and the driver’s age. This means that older people get in more accidents.

8. The correlation in real life between height and weight is r = 1.