D) The probability that the altemative hypothesis is true is 0.95 5) Consider a
ID: 3232204 • Letter: D
Question
D) The probability that the altemative hypothesis is true is 0.95 5) Consider a study comparing the levels of globin for a group of cigarette 5) smokers of size ni 41 and a group of non-smokers of size 81 It is believed that the mean carboxyhemoglobin level of the smokers must be higher than the e mean level of non-smokers. Assume that the underlying variances are identical and use o 0.05. What is the proper test for this hypothesis? B) A Z-test A) A one-sample t-test D) A paired t-test C) An unpaired t-test 6) Refer to question 5. If we define ul as the mean carboxyhemoglobin level among 6 smokers, and u2 as the mean level among non-smokers, what are the null and alternative hypotheses? A) Ho: usu 2 Ha: HI-H 7) Refer to the text in question 5.. The degrees of freedom for this test is: C) 121 D) 120 B) 60 A) 61 8) Refer to the text in question 5. This test is: D) Undecided C) Two-sided A) Lump sided B) One-sidedExplanation / Answer
1) This is an example of an unpaired t-test. hence, C is the correct answer
2) Null hypothesis , Mean 1 <= Mean2
Alternate hypothesis is Mean1 > mean 2
Hence, C is the correct answer
3) Df = n1+n2- 2 = 41+81-2=120
4) This is a one-sided test because we are measuring that the level is higher or not.
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