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A laboratory claims that the mean sodium level, μ , of a healthy adult is 138...

A laboratory claims that the mean sodium level,

μ

, of a healthy adult is

138

mEq per liter of blood. To test this claim, a random sample of

50

adult patients is evaluated. The mean sodium level for the sample is

135

mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is

15

mEq. Can we conclude, at the

0.01

level of significance, that the population mean adult sodium level differs from that claimed by the laboratory?

Math   Statistics-And-Probability   
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