а. Whаt is the sign оf Skewness аnd the minimum value оf Kurtоsis for the following density function with a normal fit? b. The STATA results are given below for the Skewness and Kurtosis tests for normality for the above density function. Interpret the results. Do you reject the null hypothesis? Joint test Variable Obs. Pr(skewness) Pr(kurtosis) Adj chi2(2) Prob>Chi2 birthweight 3,000 0.0000 0.0000 358.77 0.0000