A Sample of 30 Observations Provides the Following Statistics: S_x

A sample of 30 observations provides the following statistics: s_x = 14; s_y = 19; s_xy = -150.
A) Calculate and interpret the sample correlation coefficient r_xy.
B) Specify the hypotheses to determine whether or not x and y are significantly correlated.
C) At the 5% significance level, what is the conclusion to the test using the critical-value approach? Explain.
D) At the 5% significance level, what is the conclusion to the test using the p-value approach? Explain.