Obtain the closing prices of MSFT and the S\&P 500 Index for the period January 1, 2017, through December 31, 2017, and compute the daily log returns for this period.

(a) Compute and plot the ACFs of the returns of MSFT and of the S\&P 500 Index for this period.

(b) Test the hypothesis that the ACF of MSFT daily returns is 0 at all lags. (A statistical test does not consist of just computing a p-value; state and interpret your results.)

Test the hypothesis that the ACF of S\&P 500 returns is 0 at all lags. State and interpret your results.

You are given very few guidelines in either case. It is a part of the exercise to make some decisions.

(c) Compute and plot the CCFs of the returns of MSFT and of the S\&P 500 Index for this period.