Given a sample of 28 observations with a sample mean of 21.1 and a sample standard...

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Given a sample of 28 observations with a sample mean of 21.1 and a sample standard...

Given a sample of 28 observations with a sample mean of 21.1 and a sample standard deviation of 4.21, which of the following is the correct 98% confidence interval?

math Statistics-And-Probability

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Answer 1

Answer #1

Confidence interval, CI = Z*

Sample size, n = 28

Sample mean, = 21.1

Sample standard deviation, s = 4.21

For 98% confidence level, Z* = 2.326

CI = 21.1 2.326 x

= 21.1 1.85

= (19.25, 22.95)

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Answer 2

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