mathxl.com/Student/PlayerTest.aspx?testld=232316947¢erwin=yes STA 2122 Hybrid Fall 2021 =Quiz: Chapter 9 Quiz Question 2 of 10 This quiz: 10 point(s) possible This question: 1 point(s) possible A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s = 11.6 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires | subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? O A. The sample size is the same for all levels of confidence. O B. Decreasing the confidence level increases the sample size needed. O C. Decreasing the confidence level decreases the sample size needed. Statcrunch Calculator Time Remaining: 01:13:44 Next