A sample of 10 observations provides the following statistics:
sx = 13, sy = 18, and sxy = 117.22
a. Calculate and interpret the sample correlation coefficient rxy.
b. Specify the hypotheses to determine whether the population correlation coefficient is positive.
c. Calculate the value of the test statistic. Approximate the p-value.
d. At the 5% significance level, what is the conclusion to the test? Explain.