D Question 9 5 pts Suppose a medical researcher needs to estimate the mean white blood cell count (in cells per microliter) for adults in the US. An analysis of past studies reveals an approximate population standard deviation of 1.6 cells per jiL. What sample size is required for a 95% confidence interval of the mean white blood cell count to within 0.1 cells per /L? Including your work (formula used, variable values, algebra) at the end of the exam may provide partial credit if you do not get the final answer correct. 984 D Question 10 5 pts A researcher wants to know the effect of a drug on heart rate. She administers her drug to her treatment group, a sample of 20 patients from her hospital, and finds that they have a mean heart rate of 85 bpm with a standard deviation of 5 bpm. If she wants to construct a 99% confidence interval for the mean heart rate of patients that take the drug, calculate the EBM (or MOE). Give your answer to 2 decimal places. Including your work (formula used, variable values, algebra) at the end of the exam may provide partial credit if you do not get the final answer correct. 3.2