2. A researcher wants to know whether more births occur in September than in March. She randomly selects seven weekdays in March 2002 and seven weekdays in September 2002 and records the number of births on those days. The data are presented in the table below: Births in March Births in September 1 1,726 11,307 1 1,944 11,453 11,570 12,452 10,903 12,132 11,571 12,891 11,523 12,457 10,283 12,372 a. Compute the sample mean for each data set b. Is there a large difference in the average number of births by month? 0. Compute the sample standard deviation for each data set d. Does there appear to be a difference in the variability of births in March versus those in September