Giving a test to a group of students, the grades and gender are summarized below   A B C Total Male 13 15 10 38 Female 6 20 18 44 Total 19 35 28 82 Let p represent the proportion of all male students who would receive a grade of C on this test. Use a 90% confidence interval to estimate p to three decimal places. < p

You are interested in finding a 90% confidence interval for the mean number of visits for physical therapy patients. The data below show the number of visits for 15 randomly selected physical therapy patients. Round answers to 3 decimal places where possible.   8 15 5 18 9 28 5 14 23 25 18 20 23 9 16   a. To compute the confidence interval use a    distribution. b. With 90% confidence the population mean number of visits per physical therapy patient is between  and   visits. c. If many groups of 15 randomly selected physical therapy patients are studied, then a different confidence interval would be produced from each group. About ____percent of these confidence intervals will contain the true population mean number of visits per patient and about ____percent will not contain the true population mean number of visits per patient.

You are interested in finding a 98% confidence interval for the mean number of visits for physical therapy patients. The data below show the number of visits for 11 randomly selected physical therapy patients. Round answers to 3 decimal places where possible.   27 5 28 22 15 9 16 10 25 18 5   a. To compute the confidence interval use a   Z OR T   distribution. b. With 98% confidence the population mean number of visits per physical therapy patient is between  ?  and   ? visits. c. If many groups of 11 randomly selected physical therapy patients are studied, then a different confidence interval would be produced from each group. About  ? percent of these confidence intervals will contain the true population mean number of visits per patient and about  ? percent will not contain the true population mean number of visits per patient.

Next Question A statistics instructor randomly selected four bags of oranges, each bag labeled 10 pounds, and w that the distribution of weights is Normal. Find a 95% confidence interval for the mean weight of all bags of oranges. Use technology for your calculations. Answer parts a and b ley weighed 9.3, 9.1, 9.5, and 9.6 pounds. D Assume below. a. Choose the correct interpretation of the confidence interval below and, if necessary, fill in the answer boxes to complete your choice. O A. We are 95% confident that the sample mean is between and O B. There is a 95% chance that all intervals will be between and O C. We are 95% confident the population mean is between and O D. The requirements for constructing a confidence interval are not satisfied. (Type integers or decimals rounded to the nearest thousandth as needed. Use ascending order.) b. Does the interval capture 10 pounds? Is there enough evidence to reject the null hypothesis that the population mean weight is 10 pounds? Explain…