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A random sample of 24 items is drawn from a population whose standard deviation is unknown....

A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯ = 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

Math   Statistics-And-Probability   
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Answer #1

mean sd n t lower upper
870 25 24 2.500 857.243 882.757
870 50 24 2.500 844.486 895.514
870 100 24 2.500 818.972 921.028
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