A sam ple o f 10 observations provides th e follow ing statistics:

sx = 13, sy = 18, a n d sxy= 117.22

a. Calculate and in terpret th e sam ple correlation coefficient rxy.

b. Specify th e hypo th eses to d e te rm in e w h e th e r th e p o p u la tio n correlation coeffic ie n t is positive.

c. C alcu late th e v alue o f th e test statistic. A p p ro x im a te th e p -value.

d. At th e 5 % significance level, w h a t is th e conclusion to th e test? Explain. P-69