In your random sample of 60 cities, the mean violent crime rate is 1236.26 with a standard deviation kf 812.51. At 99% confidence interval, to estimate the population mean from your sample data, you obtain the following:
a. 1236.26 + or - 2.58 (165.24)
b. 1269.73 + or - 1.96 (105.52)
c. 1236.26 + or - 2.58 (105.52)
d. 1269.73 + or - 1.96 (98.23)