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 31 patients with arthritis took the drug for 3 months. Blood tests showed that x = 8.8 with sample standard deviation s = 3.3. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH level of the blood. USE SALT (a) What is the level of significance? State the null and alternate hypotheses. (Enter != for # as needed.) Ho- H: (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. We'll use the Student's t, since the sample size is large and is known. We'll use the Student's t, since the sample size is large and is unknown. We'll use the standard normal, since the sample size is large and is known. We'll use the standard normal, since the sample size is large and is unknown. ed C... C Compute the appropriate sampling distribution value of the sample test statistic. (Round your answer to two decimal places.) (c) Estimate the P-value. OP-value> 0.150 0.100 < P-value < 0.150 O 0.050 < P-value < 0.100 0.020 < P-value < 0.050 91 ! @ # Q DEC 19 tv 69 % 5 @ 5 MacBook Pro Sal ZA ZOOM W DOCK + 6