## Mind on statistics 5th Edition by UTTS-Test Bank

Mind on Statistics Test Bank

Chapter 7

Sections 7.1 – 7.2

Questions 1 to 6: For each situation, decide if the probability described is a subjective (personal) probability or a relative frequency probability.

1. In a sample of 1000 students majoring in the humanities, 660 were female. The 66% (660/1000) chance of a humanities major being female is a

A. subjective probability.

B. relative frequency probability.

KEY: B

2. A quarter is flipped 2000 times and results in 500 heads. The 25% (500/2000) chance of heads is a

A. subjective probability.

B. relative frequency probability.

KEY: B

3. Among 5000 new tires sold by a tire company, 20% (1000/5000) lasted more than 100,000 miles. The 20% chance that a new tire will last more than 100,000 miles is a

A. subjective probability.

B. relative frequency probability.

KEY: B

4. A football fan believes that the Oakland Raiders have a 50% chance of winning the next Super bowl. The 50% is a

A. subjective probability

B. relative frequency probability

KEY: A

5. A college basketball player has made 53% of his shots from 3-point range. The probability that he will make a 3-point shot, 53%, is a

A. subjective probability.

B. relative frequency probability.

KEY: B

6. A recent college graduate claims he only has a 30% chance of finding a job in the next two months. The chance of 30% is a

A. subjective probability.

B. relative frequency probability.

KEY: A

Questions 7 and 8: In the past five years, only 5% of pre-school children did not improve their swimming skills after taking a Beginner Swimmer Class at a certain Recreation Center.

7. The probability of 5% that a pre-school child who is taking this swim class will not improve his/her swimming skills is a

A. subjective probability.

B. relative frequency probability.

KEY: B

8. What is the probability that a pre-school child who is taking this swim class will improve his/her swimming skills?

A. 5%

B. 10%

C. 95%

D. None of the above

KEY: C

9. A survey was given to sophomores at a university and one of the questions asked was “What is the probability that you will leave school before you graduate?” The answer to this question for an individual student is an example of

A. a relative frequency probability based on long-run observation.

B. a relative frequency probability based on physical assumptions.

C. a personal probability.

D. a probability based on measuring a representative sample and observing relative frequencies that fall into various categories.

KEY: C

10. A thumbtack is tossed repeatedly and observed to see if the point lands resting on the floor or sticking up in the air. The goal is to estimate the probability that a thumbtack would land with the point up. That probability is an example of

A. a relative frequency probability based on long-run observation.

B. a relative frequency probability based on physical assumptions.

C. a personal probability.

D. a probability based on measuring a representative sample and observing relative frequencies that fall into various categories.

KEY: A

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