Question: Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the

Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of the blood). For healthy adults, the mean of the x distribution is = 7.4. A new drug for arthritis has been developed. However, it is thought that this drug may change blood pH. A random sample of 41 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.4 with sample standard deviation s = 3.1. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH level of the blood. State the null and alternate hypotheses. H0: > 7.4; H1: = 7.4 H0: = 7.4; H1: 7.4 H0: 7.4; H1: = 7.4 H0: = 7.4; H1: < 7.4 H0: = 7.4; H1: > 7.4

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