Bio statistics help

Homework Lab 13

1) A pool of test subjects was given varying amounts of caffeine pills. The testers were trying to determine if there is a correlation between the caffeine pills and how many hours is taken away from their usual sleep.

Caffeine pills (x) Hours taken away from sleep (y)

1 2 3 4 2 3 3 2 1 0 2 3

a) Using your knowledge about correlation, using SPSS calculate the correlation (r) and describe the strength of the relationship. 2) What is the correlation between prejudice and years of school? Based on this scatter plot, describe the direction and estimate the strength of the relationship (week, strong).