laboratory claims that the mean sodium level, , of a healthy adult is 2 mɛq per liter of blood. To test this claim, a random sample of 20 adult atients is evaluated. The mean sodium level for the sample is 133 mEg pe ter of blood. It is known that the population standard deviation of adul odium levels is 14 mEq. Assume that the population is normally istributed. Can we conclude, at the 0.01 level of significance, that the opulation mean adult sodium level differs from that claimed by the aboratory? erform a two-tailed test. Then complete the parts below. arry your intermediate computations to three or more decimal places, nd round your responses as specified below. (If necessary, consult a

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11:14
A laboratory claims that the mean sodium level, u, of a healthy adult is
142 mEg per liter of blood, To test this claim, a random sample of 20 adult
patients is evaluated. The mean sodium level for the sample is 133 mEg per
liter of blood. It is known that the population standard deviation of adult
sodium levels is 14 mEq. Assume that the population is normally
distributed. Can we conclude, at the 0.01 level of significance, that the
population mean adult sodium level differs from that claimed by the
laboratory?
Perform a two-tailed test. Then complete the parts below.
Carry your intermediate computations to three or more decimal places,
and round your responses as specified below. (If necessary, consult a
list of formulas.)
Transcribed Image Text:11:14 A laboratory claims that the mean sodium level, u, of a healthy adult is 142 mEg per liter of blood, To test this claim, a random sample of 20 adult patients is evaluated. The mean sodium level for the sample is 133 mEg per liter of blood. It is known that the population standard deviation of adult sodium levels is 14 mEq. Assume that the population is normally distributed. Can we conclude, at the 0.01 level of significance, that the population mean adult sodium level differs from that claimed by the laboratory? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.)
(d) Find the two critical values. (Round to three or more decimal places.)
D and ]
(e) Can we conclude that the population mean adult sodium level differs from
that claimed by the laboratory?
Yes ONo
Transcribed Image Text:(d) Find the two critical values. (Round to three or more decimal places.) D and ] (e) Can we conclude that the population mean adult sodium level differs from that claimed by the laboratory? Yes ONo
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