of these problems, perform the following steps. a. State the hypotheses and iden
ID: 3317958 • Letter: O
Question
of these problems, perform the following steps. a. State the hypotheses and identify the claim. b. Find the critical value(s). c. Compute the test value d. Make the decision e. Summarize the results. Use the traditional method of hypothesis testing unless19. otherwise specified. Cholesterol Levels is a difference in the cholesterol levels of two groups of men. A random sample of 30 men between the ages of 25 and 40 is selected and tested. The average level is 223. A second random sample of 25 men between the ages of 41 and 56 is selected and tested. The average of this group is 229. The population standard deviation for both groups is 6. At = 0.01, is there a difference in the cholesterol levels between the two groups? Find the 99% confidence interval for the difference of the two means. 14. A researcher wishes to see if there 20. 15. Apartment Rental Fees The data shown are the rental fees (in dollars) for two random samples of apartments in a large city. At 0.10, can it be concluded that the average rental fee for apartments in the east is greater than the average rental fee in the west? Assume a 119 and 2 = 103. West East 380 499 500 550390 795 554 450 370 21. 389 350 450 540 445 420 525 400 310 375 750 530 350 385 395 425 500 550 100 450 365 425Explanation / Answer
Solution14
Z alpha/2 for 99%=2.576
99% confidence interval for difference in means
=(change in means)+-zcrit(standard error)
=(223-229)+-2.576(6^2/30+6^2/25)
=-6+-2.576sqrt((36/30+36/25))
=-6-4.185505,-6+4.185505
=-10.1855,-1.814495
lower limit=-10.1855
upper limit=-1.814495
Since confidence interval contains -6 ,Fail to reject Null hypothesis
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.