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 36 patients with arthritis took the drug for 3 months. Blood tests showed that * = 8.8 with sample standard deviations = 3.5. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH level of the blood. What is the value of the sample test statistic? (Round your answer to three decimal places.) (e) Interpret your conclusion in the context of the application. O There is sufficient evidence at the 0.05 level to conclude that the drug has changed the mean pH level of the blood. O There is insufficient evidence at the 0.05 level to conclude that the drug has changed the mean pH level of the blood