Sample Size Using Sample Data You want to estimate the mean diastolic blood pressure level of adult females. Refer to Data Set 1 in Appendix B and find the maximum and minimum diastolic blood pressure level for females, then use those values with the range rule of thumb to estimate s. How many adult females must you randomly select and test if you want to be 95% confident that the sample mean diastolic blood pressure level is within 3 mm Hg of the true population mean m? If, instead of using the range rule of thumb, the standard deviation of the female diastolic blood pressure levels in Data Set 1 is used as an estimate of s, is the required sample size very different? Which sample size is likely to be closer to the correct sample size?