g A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is x⎯⎯ = 880 and the sample standard deviation is s = 5. Use Appendix D to find the values of Student’s t. (a) Construct an interval estimate of μ with 99% confidence. (Round your answers to 3 decimal places.) The 99% confidence interval is from to (b) Construct an interval estimate of μ with 99% confidence, assuming that s = 10. (Round your answers to 3 decimal places.) The 99% confidence interval is from to (c) Construct an interval estimate of μ with 99% confidence, assuming that s = 20. (Round your answers to 3 decimal places.) The 99% 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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In a random sample of 81 audited estate tax​ returns, it was determined that the mean amount of additional tax owed was ​$3408 with a standard deviation of ​$2565. Construct and interpret a​ 90% confidence interval for the mean additional amount of tax owed for estate tax returns. The lower bound is ​$ nothing. ​(Round to the nearest cent as​ needed.) The upper bound is ​$ nothing. ​(Round to the nearest cent as​ needed.) Interpret a​ 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Choose the correct answer below. a. One can be​ 90% confident that the mean additional tax owed is less than the lower boundb. One can be​ 90% confident that the mean additional tax owed is between the lower and upper boundsc. One can be​ 90% confident that the mean additional tax owed is greater than the upper bound.

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general 10 months ago 7226