# Null Hypothesis

A laboratory claims that the mean sodium level... see attached

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#### Solution Summary

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. Can we conclude, at the 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.

Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.

The null hypothesis: H : ____

0

The alternative hypothesis: H : _____

1

The type of statistic: a. Z

b. t

c. Chi square

d. F

The value of the test statistic: ______

(Round your answer to at least

three decimal places.)

The p-value: _____

(Round your answer to at least

three decimal places.)

Can we conclude that the population mean adult sodium level differs from that claimed by the laboratory? Yes or No?