The follow-up study described in the previous exercise also looked at MLB players whose first or last initial was D. For MLB players born between 1875 and 1930, there were 53 birth years with the values of X having a mean of −0.81 and a standard deviation of 4.87.

For all players, there were 73 birth years with the values of X having a mean of −0.26 and a standard deviation of 5.42. For each of these two data sets, calculate the two-sided P value for a test of the null hypothesis that the population mean is 0.