An old medical textbook states that the mean sodium level for healthy adults is 142 11115421 per liter of blood. A medical researcher believes that, because of modern dietary habiis, the mean sodium level for healthy adults, u, now differs from that given in the textbook. A random sample of 90 healthy adults is evaluated. The mean sodium level for the sample is 140 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 15 mEq. Can we conclude, at the 0.01 level of signicance, that the population mean adult sodium level differs from that given in the textbook? Perform a two-tailed test. Then complete the pans below. Carry your intermediate computations to three or more decimal places, and round your responses as specied below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0 and the alternative hypothesis H1. l1 O' p H0 :D _ H1 :D (b) Determine the type of test statistic to use. (c) Find the value of the test statistic. (Round to three or more decimal places.) I] (d) Find the p-value. (Round to three or more decimal places.) III (e) Can we conclude that the population mean adult sodium level differs from that given in the textbook? )1 (n 15> OYes O No