Find a confidence interval for assuming that each sample is from a normal population (Round the valu

Find a confidence interval for  assuming that each sample is from a normal population (Round the value of t to 3 decimal places and your final answers to 2 decimal places)

(a) x= 24, s = 5, n = 9, 90 percent confidence

The 90% confidence interval is to

(b) x= 45, s = 5, n = 19, 99 percent confidence

The 99% confidence interval is to

(c) x= 129, s = 10, n = 20, 95 percent confidence

The 95% confidence interval is to

 

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