Please explain #9

dence level should be used for the c be 21.1 sec 1.10 mg. The sample size is n = 25 and the test statistic is t = 3.349. 6. Cigarette Tar The claim is that for the tar amounts in king-size cigarettes, M > 20.0 mg The sample size is n = 25 and the test statistic is t = 1.733. 7. Car Crash Tests The claim is that for measurements of standard head injury criteria in car crash tests, u = 475 HIC (standard head injury condition units). The sample size is n = 21 and the test statistic is t = -2.242. 8. Pulse Rates The claim is that for pulse rates of women, M - 73. The sample size is n = 40 and the test statistic is t = 2.463. Testing Hypotheses. In Exercises 9-24, assume that a simple random sample has been selected and test the given claim. Unless specified by your instructor, use either the P-value method or the critical value method for testing hypotheses. Identify the null and alternative hypotheses, test statistic, P-value (or range of P-values), critical value(s), and state the final conclusion that addresses the original claim. 9. Chocolate Chip Cookies The Chapter Problem for Chapter 3 includes the sample mean of the numbers of chocolate chips in 40 Chips Ahoy reduced fat cookies. The sample mean is x = 19.6 chocolate chips and the sample standard deviation is 3.8 chocolate chips. Use a 0.05 significance level to test the claim that Chips Ahoy reduced-fat cookies have less fat because they have a mean number of chocolate chips that is less than the mean of 24 for regular Chips Ahoy cookies. See the accompanying TI-83/84 Plus display that results from this hypothesis test. TI-83/84 PLUS T-Test MK24 t=-> . 323169318 P=3. 873258-9 X=19. 6 SX=3.8 n=40