A sample of 20 items provides a sample standard deviation of 11.
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.
Homework Answers
A sample of 30 items provides a sample standard deviation of 14 a. Compute the 90%...
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).
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Suppose a random sample of 23 items produces a sample standard deviation of 11. 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.)
Suppose a random sample of 13 items produces a sample standard deviation of 16. a. Use...
Suppose a random sample of 13 items produces a sample standard deviation of 16. 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. (Round to two decimal places as needed.) b. so2s (Round to two decimal places as needed.)
a random sample of 11 items is drawn from a population whose standard deviation is unknown....
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...
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A sample of 19 items provides a sample standard deviation of 5.4. Test the following hypotheses using α = 0.05. What is your conclusion? Use both the p-value approach and the critical value approach.H₀: σ² ≤ 65 Hα: σ²>65Test statistic = _______ (to 2 decimals) p-value low from table = _______ (to 3 decimals). Use Table 11.1. p-value high from table = _______ (to 3 decimals). Use Table 11.1. X0.052 = _______ Reject H0 if χ2 ≥ _______ . (to 3 decimals)
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A sample of 14 items provides a sample standard deviation of 3.8. Test the following hypotheses using a = 0.05. What is your conclusion? Use both the p-value approach and the critical value approach. Ho : o2 < 30 Hq : 02 > 30 Test statistic = (to 2 decimals) p-value low from table = (to 3 decimals). Use Table 11.1. p-value high from table = (to 3 decimals). Use Table 11.1. Xổ.05 = (to 3 decimals) Reject Ho if...
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A simple random sample of 60 items resulted in a sample mean of 74. The population standard deviation is 14. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). ( , )
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).
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.)
Suppose a random sample of 13 items produces a sample standard deviation of 16. 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. (Round to two decimal places as needed.) b. so2s (Round to two decimal places as needed.)
A sample of 14 items provides a sample standard deviation of 3.8. Test the following hypotheses using a = 0.05. What is your conclusion? Use both the p-value approach and the critical value approach. Ho : o2 < 30 Hq : 02 > 30 Test statistic = (to 2 decimals) p-value low from table = (to 3 decimals). Use Table 11.1. p-value high from table = (to 3 decimals). Use Table 11.1. Xổ.05 = (to 3 decimals) Reject Ho if...
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