40. Find the value of the standardized z-test statistic. b) -1.95 c) 1.95 d) 2.0

Question

40. Find the value of the standardized z-test statistic. b) -1.95 c) 1.95 d) 2.011 a) -2.011 41. The test for the hypotheses above will be: a) Left-tailed b) Two-tailed c) Right-tailed Use the following to answer questions 42-44: On the first day of class, students in a large introduct statistics course were asked their sex and eye color. The results are summarized in the provided table Blue BrownGreenHazel A 21 17 38 10 Female Male Total 24 20 10 21 18 121 42. What is the probability that a randomly selected student has hazel eyes if we know that the s is male? a)0.476 b) 0.382 c) 0.182 d) 0.083 43. What is the probability that a randomly selected student does not have hazel eyes? a) 0.174 b) 0.455 c) 0.826 d) 0.903 44. What is the probability that a randomly selected student has brown eyes and has blue eyes. result to determine if brown and blue eyes are disjoint for this sample. a) P(brown and blue) 0; Yes, they are disjoint b) P(brown and blue) 0; No, they are not disjoint c) P(brown and blue)-1; Yes, they are disjoint

Explanation / Answer

Q 42

P(Student has hazel eyes | male) = P(Hazel eyes and male )/P(male) = 10/55 =0.182

Answer: Option C)

Q 43

P(Student does not have hazel eyes) = 1-P(Student has hazel eyes) = 1-(21/121) = 1-0.1736 =0.826

Answer: Option C)

Q 44

Answer: a) P(brown and blue ) = 0; Yes they are disjoint

Reason : because student can not have both brown eyes and blue eyes

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