Suppose a random sample of 13 items produces a sample standard deviation of 16. a. Use...
Suppose a random sample of 23 items produces a sample standard deviation of 11. a. Use the sample results to develop a 90% confidence interval estimate for the population variance. b. Use the sample results to develop a 95% confidence interval estimate for the population variance. a. Iso²s (Round to two decimal places as needed.) b. sos (Round to two decimal places as needed.)
A random sample of 16 items is drawn from a population whose standard deviation is unknown. The sample mean is = 890 and the sample standard deviation is s= 15. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of u with 95% confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from O t o D (b) Construct an interval estimate of u with 95% confidence, assuming that s=...
A sample of 20 items provides a sample standard deviation of 11. a. Compute the 90% confidence interval estimate of the population variance (to 2 decimals). Use Table 11.1. b. Compute the 95% confidence interval estimate of the population variance (to 2 decimals). Use Table 11.1.c. Compute the 95%confidence interval estimate of the population standard deviation (to 1 decimal). Use Table 11.1.
A sample of 30 items provides a sample standard deviation of 14 a. Compute the 90% confidence interval estimate of the population variance (to 2 decimals). b. Compute the 95% confidence interval estimate of the population variance (to 2 decimals). C. Compute the 95% confidence interval estimate of the population standard deviation (to 1 decimal).
a random sample of 11 items is drawn from a population whose standard deviation is unknown. The sample mean is x= 920 and the sample standard deviation is s = 25. Use Appendix D to find the values of Studengs t. a) Construct an interval estimate of u with 95% confidence. b) Construct an interval estimate of u with 95% confidence, assuming tha s=50. c) Construct an interval estimate of u with 95% confidence, assuming that s= 100 Round your...
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence ntervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals A random sample of 45 home theater systems has a mean price of $138.00. Assume the population standard deviation is 516.40. Construct a 90% confidence interval for the population mean. The 90% confidence interval...
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 39 business days, the mean closing price of a certain stock was $113.67. Assume the population standard deviation is $10.91. The 90% confidence interval is (1 , b). (Round to two decimal places as needed.)
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 64 dates, the mean record high daily temperature in a certain city has a mean of 85.80°F. Assume the population standard deviation is 15.07°F. The 90% confidence interval is (ID). (Round to two decimal places as needed.) The...
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals From a random sample of 57 dates, the mean record high daily temperature in a certain city has a mean of 83.56°F. Assume the population standard deviation is 14 43°F. The 90% confidence interval is (0) (Round to two decimal places as needed.)...
Please explain and write clearly. A sample of 20 items provides a sample standard deviation of 5. a. Compute the 90% confidence interval estimate of the population variance. b. Compute the 95% confidence interval estimate of the population variance.c. Compute the 95% confidence interval estimate of the population variance.