To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and then has their LDL levels measured again (After). Subject Before After 1 172 140 2 123 111 3 112 90 4 145 116 5 111 92 200 167 7 112 96 8 167 133 197 178 10 121 129 Give a 91.1% confidence interval for uR - HA, the difference between LDL levels before and after taking the medication. Confidence Interval =

Question Help ▼ The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 22 minutes and a standard deviation of 5 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 17 minutes, (b) between 22 and 31 minutes, and (c) more than 30 minutes. (a) The probability that a randomly selected athlete uses a stairclimber for less than 17 minutes is. (Round to four decimal places as needed.) ts pur ESS ess brai Enter your answer in the answer box and then click Check Answer. Check Answer Clear All cions 2 parts remaining e here to search

3- What is the confidence level for the interval it 1.47? Vn

The confidence interval for a population mean is (7.43, 7.59). What are the sample mean and the margin of error? Margin of Error = Give your answers as decimals, to two places.