Question

In: Statistics and Probability

A simple random sample of size n is drawn from a population that is normally distributed....

A simple random sample of size n is drawn from a population that is normally distributed. The sample​ mean, x overbar​, is found to be 115​, and the sample standard​ deviation, s, is found to be 10. ​(a) Construct a 96​% confidence interval about mu if the sample​ size, n, is 12. ​(b) Construct a 96​% confidence interval about mu if the sample​ size, n, is 21. ​(c) Construct a 98​% confidence interval about mu if the sample​ size, n, is 12. ​(d) Could we have computed the confidence intervals in parts​ (a)-(c) if the population had not been normally​ distributed?

Solutions

Expert Solution

Refer t-table or use excel function "=T.INV.2T(0.04,11)" to find the value of t.

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Refer t-table or use excel function "=T.INV.2T(0.04,20)" to find the value of t.

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Refer t-table or use excel function "=T.INV.2T(0.02,11)" to find the value of t.

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