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Homework: Online assignment #5 Confidence Intervals (chapter Score: 0.6 of1 pt { 90f14(10complete)v ) HW Score: 47.14%,6.6 of14 pts 7..213-T Question Help V '0- A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 13 subjects had a mean wake time of 105.0 min. After treatment, the 13 subjects had a mean wake time of 84.9 min and a standard deviation of 22.3 min. Assume that the 13 sample values appear to be from a normally distributed population and construct a 90% condence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 105.0 min before the treatment? Does the drug appear to be effective? Construct the 90% condence interval estimate of the mean wake time for a population with the treatment. Dmin

Hw Score: 42.86%, 6 of 14 pts *7.3.35 Question Help V 0 Using the simple random sample of weights of women from a data set, we obtain these sample statistics: n =45 and i = 143.06 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by a = 30.72 lb. a. Find the best point estimate of the mean weight of all women. b. Find a 90% condence interval estimate of the mean weight of all women. Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Homework: Online assignment #5 Confidence Intervals (chapter Score: 0 of 1 pt 4 12 of 14 (10 complete) V E] HW Score: 42.86%, 5 of 14 pts *7.3.36 Question Help V O Randomly selected students participated in an experiment to test their ability to determine when one minute (or sixty seconds) has passed. Forty students yielded a sample mean of 61.4 seconds. Assuming that 6 = 9.4 seconds, construct and interpret a 95% condence interval estimate of the population mean of all students. Click here to view a t distribution table. Click here to view p_age 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the 95% condence interval for the population mean p? D