Answer Happy

Using the simple random sample of weights of women from a data set, we obtain these sample statistics: n = 40 and X= 153.21 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by a = 32.06 lb. a. Find the best point estimate of the mean weight of all women. b. Find a 95% confidence interval estimate of the mean weight of all women. Click here to view at distribution table. Click here to view Rage 1 of the standard normal distribution table Click here to view page 2 of the standard normal distribution table a. The best point estimate is 153.21 lb. (Type an integer or a decimal.) b. The 95% confidence interval estimate is b<<1b (Round to two decimal places as needed.) 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 62.3 seconds. Assuming that a = 10.5 seconds, construct and interpret a 95% confidence interval estimate of the population mean of all students Click here to view at 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. What is the 95% confidence interval for the population mean? [<< (Type integers or decimals rounded to one decimal place as needed.) A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 15 subjects had a mean wake time of 104.0 min. After treatment, the 15 subjects had a mean wake time of 80.3 min and a standard deviation of 23.1 min. Assume that the 15 sample values appear to be from a normally distributed population and construct a 95% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 104.0 min before the treatment? Does the drug appear to be effective? Construct the 95% confidence interval estimate of the mean wake time for a population with the treatment. min<<min (Round to one decimal place as needed.)