An old medical textbook states that the mean sodium level for healthy adults is 141 mEq per liter of blood. A medical re

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An old medical textbook states that the mean sodium level forhealthy adults is
141
mEq
per liter of blood. A medical researcher believes that,because of modern dietary habits, the mean sodium level for healthyadults,
μ
, now differs from that given in the textbook.A random sample of
90
healthy adults is evaluated. The mean sodiumlevel for the sample is
142
mEq
per liter of blood. It is known that the populationstandard deviation of adult sodium levels is
10
mEq
. Can we conclude, at the
0.01
level of significance, that the populationmean adult sodium level differs from that given in thetextbook?
Perform a two-tailed test. Then complete the partsbelow.
Carry your intermediate computations to three or more decimalplaces, and round your responses as specified below. (If necessary,consult a list of formulas.)