Q$2$: $(15$ points$)$ The data file assignment$\_1.$txt contains stock returns for $$ge$($General

Electric$),$vw$($value$-$weighted market returns$),$ew$($equal$-$ weighted market

returns$),$ and $$sp$($Standard Poor composite index$).$ The time span of the data

ranges from Jan $1940$ to Sept $2011.$ Please do following work within R$/$RStudio

environment: $($a$)$ Compute the sample mean, standard deviation, skewness, excess

kurtosis, minimum, and maximum of each simple return series. $($b$)$ Transform the

simple returns to log returns and redo part $($a$).($c$)$ Test the null hypothesis that the

mean of the log returns of $$ge$$ stock is zero. Use $5\%$ significance level to draw your

conclusion.