If Upper X overbar=126 sigma=22 n=31 construct a 99% confidence interval estimate of the population mean,...

Question

Question

If Upper X overbar=126

sigma=22

n=31

construct a 99% confidence interval estimate of the population mean, u

Answer 1

Answer #1

Since sigma is given, we will be using z confidence interval.

For 99% confidence interval, z = 2.576

Hence,

99% confidence interval will be:

$126 \pm 2.576*22/\sqrt{31}$

$126 \pm 10.18$

(115.82, 136.18)

Answer 2

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