A random sample of 20 observations selected from a normal population produced x 72 6 and s2 19 4 a Form a 90 confidence interval for m b Test H0 80 against Ha 80 Use 05 c Test H0 80 against Ha 80 Use 01 d Form a 99 confidence interval for m e How large a sample would be required to estimate to with...

a For confidence coefficient 90 10 and 2 05 From Table VI Appendix A with df n 1 20 1 19 t 05 1729 T ...

A random sample of 20 observations selected from a normal population produced x = 72.6 and s2

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A random sample of 20 observations selected from a normal population produced x = 72.6 and s2 = 19.4.

a. Form a 90% confidence interval for m.

b. Test H0:µ= 80 against Ha: µ< 80. Use α = .05.

c. Test H0:µ= 80 against Ha: µ≠ 80. Use α = .01.

d. Form a 99% confidence interval for m.

e. How large a sample would be required to estimate µ to within 1 unit with 95% confidence?

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Statistics

ISBN: 9780321755933

12th Edition

Authors: James T. McClave, Terry T Sincich

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Question Posted: May 20, 2015 05:43 AM

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A random sample of 20 observations selected from a normal population produced x = 72.6 and s2

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