The Student's t distribution table gives critical values for the Student's t distribution. Use an appropriate d.f. as the row header. For a right-tailed test, the column header is the value of a found in the one-tail area row. For a left-tailed test, the column header is the value of a found in the one-tail area row, but you must change the sign of the critical value t to -t. For a two-tailed test, the column header is the value of a from the two-tail area row. The critical values are the tt values shown. 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 µ = 7.4t. 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 = 8.0 with sample standard deviation s = 1.8. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH level of the blood. Solve the problem using the critical region method of testing (i.e., traditional method). (Round your answers to three decimal places.) test statistic = critical value = +

Question 1(b)

Consider the following problem: "You and a friend go to dinner with four couples. Before dinner, everyone shakes hands with each person that they've never met. During dinner, you ask everyone how many hands they shook. You get the following answers: 0, 1, 2, 3, 4, 5, 6, 7, 8. How many hands did your friend shake?" Which of these problems below represent a simpler problem that could help you solve this one? O You and a friend go to dinner with two couples, and everyone shakes each othes person's hand. How many handshakes did your friend give? O You and a friend go to dinner with one couple, and everyone shakes hands with each person they've never met. During dinner, you ask everyone how many hands they shook. You get the following answers: 1, 1, 1. How many hands did you shake? O You go to dinner with two couples, and everyone shakes each other person's hand. How many handshakes total happened? O You and a friend go to dinner with one couple, and everyone shakes hands with each person…

Hello. Can I get help on how to work this problem? Thank You!