Please find the critical value(s)

9 Homework Question 2, 9.2.27-T HW Score: 13.81%, 1.24 of 9 points Part 2 of 6 Points: 0 of 1 Save A government's department of transportation requires tire manufacturers to provide performance information on tire sidewalls to help prospective buyers make their purchasing decisions. One very V important piece of information is the tread wear index, which indicates the tire's resistance to tread wear. A tire with a grade of 200 should last twice as long, on average, as a tire with a grade of 100. A consumer organization wants to test the actual tread wear index of a brand name of tires that claims "graded 200" on the sidewall of the tire. A random sample of n = 18 indicates a sample mean tread wear index of 195.1 and a sample standard deviation of 21.8. Complete parts (a) and (b) below. Click here to view page 1 of the table of the critical values of t. Click here to view page 2 of the table of the critical values of t. a. Is there evidence that the population mean amount is different from a grade of 200? (Use a 0.05 level of significance.) State the null and alternative hypotheses. Ho: H = 200 Hy: H # 200 Identify the critical value(s). The critical value(s) is(are). (Round to four decimal places as needed. Use a comma to separate answers as needed.)