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Do Homework Chase Huckeby - Google Chrome Secure | https://www.mathxl.com yerHomework.aspx?homeworkId=44206421 8&questionld; = 1 &flushed; = false&cld-463; 591 2&centerwin; =yes Econ 2843: Elements of Statistics (Fall 2017, Section 3) Chase Huck eby 12/4/17 6:17 PM Homework: H.W. 9.2 Score: 0 of 1 pt 9.2.27 Save 5015(3 complete ) HW Score: 35.27%, 1 76 of 5 pts Question Help 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 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 ofthe tire. A random sample of n 18 indicates a sample mean tread wear index of 1954 and a sample standard deviation of 21 6 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 oft. a. Is there evidence that the population mean amount is different from a grade of 200? (Use a 0.10 level of significance.) State the null and alternative hypotheses H0: = 200 H1 : # 200 Identify the critical value(s). The critical value(s) is(are) L Round to four decimal places as needed. Use a comma to separate answers as needed.) Enter your answer in the answer box and then click Check Answer parts Clear All Check Answe

Explanation / Answer

Solution:-

The following information is provided: the requested significance level is =0.1, for the two-tailed case.

The t-critical values for a two-tailed test, for a significance level of =0.1 are

tc=1.74 and tc=1.74

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t-value (right-tail): 1.33337939

t-value (two-tailed): +/- 1.73960673

3

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