An old medical textbook states that the mean sodium level for healthy adults is 138mEq per liter of blood. A medical researcher believes that, because of modern dietary habits, the mean sodium level for healthy adults, μ, now differs from that given in the textbook. A random sample of 60 healthy adults is evaluated. The mean sodium level for the sample is 142mEqper liter of blood. It is
An old medical textbook states that the mean sodium level for healthy adults is 138mEq per liter of blood. A medical researcher believes that, because of modern dietary habits, the mean sodium level for healthy adults, μ, now differs from that given in the textbook. A random sample of 60 healthy adults is evaluated. The mean sodium level for the sample is 142mEqper liter of blood. It is known that the population standard deviation of adult sodium levels is13 mEq. Can we conclude, at the 0.05 level of significance, that the population mean adult sodium level differs from that given in the textbook? 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.)
(For z test statistics) every expert has gotten the z test statistic wrong thus far. I have included pictures of a sample problem and formula.
A. State the null hypothesis H0 and the alternative hypothesis H1
B. Find the value of the test statistic. (Round to three or more decimal places.)
C.
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