Perform a t-test for American Express with the null hypothesis that the mean of its logreturn is zero.

(2) Perform a Wilcoxon signed-rank test for American Express with the null hypothesis thatthe mean of its log return is zero.

(3) Perform a two-sample t-test to conclude if the mean returns of Pfizer and AmericanExpress are same or nor.

(4) Perform a two-sample Wilcoxon test to conclude if the mean returns of Pfizer andAmerican Express are same or nor.

(5) Compare the variance of log returns for Pfizer and American Express.