LED Take Test: Final Exam-Part Remaining Time: 2 hours, 54 minutes, 24 seconds.
ID: 3268481 • Letter: L
Question
LED Take Test: Final Exam-Part Remaining Time: 2 hours, 54 minutes, 24 seconds. Question Completion Status: QUESTION 2 2 points Save Answer 13) A final exam in Math 160 has a mean of 73 with standard deviation 7.8. If 24 students are randomly selected, find the probability that the mean of their test scores is less than 76. A) 0.8962 B) 0.0301 C) 0.9699 D) 0.9203 O A 2 points Save Answer A researcher obtains independent simple random samples of men and women between the ages of 20 and 29. She finds that 35 of the 410 men and 59 of 398 women suffered from insomnia at least once a week during the past year. Are the requirements for inference with the two-proportion z-test satisfied? O Yes, since the samples are independence and for each sample there are at least five successes and at least five failuresExplanation / Answer
Answer:
13).
Standard error = sd/sqrt(n) = 7.8/sqrt(24) =1.5922
Z value for 76, z = (76-73)/1.5922 =1.88
P( mean x <76) = p( z < 1.88) =0.9699
Answer: C
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