Question: A random sample of 11 items is drawn from a population whose standard deviation is unknown. The sample mean is x x = 810 and

A random sample of 11 items is drawn from a population whose standard deviation is unknown. The sample mean is x

x = 810 and the sample standard deviation is s = 20. Use Appendix D to find the values of Student's t.

(a) Construct an interval estimate of with 98% confidence.(Round your answers to 3 decimal places.)

The 98% confidence interval is from Not attempted

to Not attempted

(b) Construct an interval estimate of with 98% confidence, assuming that s = 40. (Round your answers to 3 decimal places.)

The 98% confidence interval is from Not attempted

to Not attempted

(c) Construct an interval estimate of with 98% confidence, assuming that s = 80. (Round your answers to 3 decimal places.)

The 98% confidence interval is from Not attempted

to

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