A random sample of 11 Items Is drawn from a populatlon whose standard devlatlon Is unknown. The sample mean Is =810 and the sample standard devlation Is s= 20. Use Appendix to find the values of Student's t (a) Construct an Interval estimate of u with 98% confidence. (Round your answers to 3 decimal places.) The 98% confidence interval is from to (b) Construct an Interval estimate of u with 98% confidence, assumlng that s = 40. (Round your answers to 3 decimal places.) The 98% confidence interval is from to (c) Construct an Interval estimate of u with 98% confidence, assuming that s = 80. (Round your answers to 3 decimal places.) The 98% confidence interval is from to

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