T F 8. You decide to throw threecoins in the air at once and record the face up
ID: 2916043 • Letter: T
Question
T F 8. You decide to throw threecoins in the air at once and record the
face up side of the coins after they land. The sample space ofthe
experiment is composed of three elements.
T F 9. Two fair coins are tossedat the same time. The probability that
both show heads is 0.5
T F 10. In a sample of 100 childbearing mothers, 45 had a girl, 47 had a
boy and 8 had twin girls. If one of the children is selectedat
random, there is a 47% chance it is a boy.
T F 11. The probability thatX takes on a value that is between 3 and
inclusive of 4 can be written as P(3<x4).
T F 12. Professor Stats hasdecided that no one will get an A unless the
final exam score is at least 1.5 standard deviations above the
mean. Given a mean score of 75 and a standard deviation of10, a
final exam score must be 90 or more to receive an A
T F 13. If two sample means areidentical, then the ration of the two
sample variances will equal 1.
T F 14. The mean of all possiblesample means is equal to the population
mean.
T F 15. If the upper bound of aconfidence interval is added to the lower
bound, the sum is the sample mean.
Explanation / Answer
8. F 9. F. Should be 25%. 10. F. Should be 47/108 = 43.5% 11. T 12. T 13. F 14. T. Assuming the sets of samples are non-overlapping. 15. F
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