Movie companies need to predict the gross receipts of individual movies once a movie has debuted. The data, shown in the next column and stored in PotterMovies , are the first weekend gross, the U.S. gross, and the worldwide gross (in $ millions) of the eight Harry Potter movies:

Title	First Weekend	US Gross	Worldwide Gross
Sorcerer's Stone	90.295	317.558	976.458
Chamber of Secrets	88.357	261.988	878.988
Prisoner of Azkaban	93.687	249.539	795.539
Goblet of Fire	102.335	290.013	896.013
Order of the Phoenix	77.108	292.005	938.469
Half-Blood Prince	77.836	301.460	934.601
Deathly Hallows Part I	125.017	295.001	955.417
Deathly Hallows Part II	169.189	381.011	1328.111

a. Compute the covariance between first weekend gross and U.S. gross, first weekend gross and worldwide gross, and U.S. gross and worldwide gross.

b. Compute the coefficient of correlation between first weekend gross and U.S. gross, first weekend gross and

c. Which do you think is more valuable in expressing the relationship between first weekend gross, U.S. gross, and worldwide grossthe covariance or the coefficient of correlation? Explain.

d. Based on (a) and (b), what conclusions can you reach about the relationship between first weekend gross, U.S.

PLEASE EXPLAIN YOUR ANSWER AND I'LL MARK MOST HELPFUL