A laboratory claims that the mean sodium level, μ , of a healthy adult is 142 mEq per liter of blood. To test this claim, a random sample of 45 adult patients is evaluated. The mean sodium level for the sample is 143 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 13 mEq. Assume that the population is normally distributed. Can we conclude, at the 0.1 level of significance, that the population mean adult sodium level differs from that claimed by the laboratory? Perform a two-tailed test.
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A laboratory claims that the mean sodium level,
, of a healthy adult is
mEq per liter of blood. To test this claim, a random sample of
adult patients is evaluated. The mean sodium level for the sample is
mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is
mEq. Assume that the population is
level of significance, that the population mean adult sodium level differs from that claimed by the laboratory?
Perform a two-tailed test. Then fill in the table below.
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