When performing a hypothesis test upon two dependent samples, the variable of interest is
A) the absolute value of the differences that exist between the matched-pair data.
B) the data that is the same in both samples.
C) the differences that exist between the matched-pair data.
D) all of the combined data.
Q. 2A state highway patrol official wishes to estimate the number of legally intoxicated drivers on a certain road.
a) How large a sample is needed in order to be 95 confident that the sample proportion will not differ from the true proportion by more than 2?
b) Repeat part (a) assuming previous studies found that 75 of the drivers on this road are legally intoxicated.
Q. 3The mean monthly gasoline bill for one household is greater than 160. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?
A) There is sufficient evidence to reject the claim > 160.
B) There is not sufficient evidence to reject the claim > 160.
C) There is sufficient evidence to support the claim > 160.
D) There is not sufficient evidence to support the claim > 160.
Q. 4John has six bills of paper money in the following denominations: 1, 5, 10, 20, 50, and 100 If he selects 3 bills at a time how many, how many groups can be formed?
A) 10 B) 15 C) 20 D) 30
Q. 5The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2600 miles.
What is the probability a particular tire of this brand will last longer than 57,400 miles?
A) 0.7266 B) 0.2266 C) 0.8413 D) 0.1587
Q. 6A company sponsoring a new Internet search engine wants to collect data on the ease of using it. Which is the best way to collect the data?
A) sample survey
B) census
C) observational study
D) experiment
E) simulation
Q. 7In the American version of the Game Roulette, a wheel has 18 black slots, 8 red slots and 2 green slots. All slots are the same size. In a carnival game, a person wagers 2 on the roll of two dice. A person can wager on either red or black.
Green is reserved for the house. If a player wagers 5 on either red or black and that color comes up, they win 10 otherwise they lose their wager. What is the expected value of playing the game once?
A) 0.26 B) -0.50 C) -0.26 D) 0.50
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