Section Exercise 8-22 A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is = 870 and the sample standard deviation is s = 25. Use Appendix D to find the values of Student’s t. (a)Construct an interval estimate of μ with 98% confidence. (Round your answers to 3 decimal places.) The 98% confidence interval is from to (b)Construct an interval estimate of μ with 98% confidence, assuming that s = 50. (Round your answers to 3 decimal places.) The 98% confidence interval is from to (c)Construct an interval estimate of μ with 98% confidence, assuming that s = 100. (Round your answers to 3 decimal places.) The 98% confidence interval is from to (d)Describe how the confidence interval changes as s increases. The interval stays the same as s increases. The interval gets wider as s increases. The interval gets narrower as s increases.
Section Exercise 8-22A random sample of 24 items is drawn from a population whose standard
deviation is unknown. The sample mean is = 870 and the sample standard deviation is s = 25. Use Appendix D to find the values of Student’s t.
(a)Construct an interval estimate of μ with 98% confidence. (Round your answers to 3 decimal places.)
The 98% confidence interval is from to
(b)Construct an interval estimate of μ with 98% confidence, assuming that s = 50. (Round your answers to 3 decimal places.)
The 98% confidence interval is from to
(c)Construct an interval estimate of μ with 98% confidence, assuming that s = 100. (Round your answers to 3 decimal places.)
The 98% confidence interval is from to
(d)Describe how the confidence interval changes as s increases.
The interval stays the same as s increases.
The interval gets wider as s increases.
The interval gets narrower as s increases.
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