1. Question: Events A and B are mutually exclusive. The probability of Event A occurring is 0.15; the probability of B occurring is 0.45. What is the probability that A or B will occur?
2. Question: Of 680 college students surveyed, 540 reported that they held a part-time job. What is the probability of selecting a student with a part-time job from this group?
3. Question: P(A) = 0.40; P(B) = 0.25; the probability of both events occurring is 0.15. If the events are not mutually exclusive, what is the probability of either event occurring?
4. Question: P(A) = 0.80; P(B) = 0.60; if the events are independent, what is the probability of both events occurring?
5. Question: Please answers questions 5-7 based on the following information:
A student survey revealed the following data concerning employment status:
Class Level/Job Status None Part-time Full-time
Freshman 16 52 12
Sophomore 4 26 20
Junior 8 18 34
Senior 0 22 18
What is the probability that the selected person is employed on a part-time basis?
6. Question: What is the probability that the selected person is a senior working full-time?
7. Question: What is the probability that the selected person is a freshman employed on a part-time basis?
8. Question: The number of ways in which 7 items can be taken 4 at a time, without regard to order, is:
9. Question: A binomial probability distribution:
has a constant probability of success in each trial.
determines the result of a trial based on the result of the previous trial.
has mutually exclusive outcomes.
Both A and C
10. Question: A study determines that 60% of the voters in a town intend to vote for the incumbent mayor. If a sample of 8 people is selected, what is the approximate probability that 6 of the 8 people surveyed intend to vote for the incumbent (using the binomial probability formula)?
Your Answer: 0.21
11. Question: What is the probability that exactly 2 heads will be tossed in 5 consecutive coin tosses?
Your Answer: 0.03125
not calculable without additional data.
12. Question: The __________ distribution is most appropriate to use when the population is finite and sampling is made without replacement.
Your Answer: normal
13. Question: A large-sample test to determine the average life of a type of alkaline battery is most likely to use the:
Your Answer: normal distribution.
14. Question: If an average of 0.5 customers arrive per minute at a ticket counter, what is the probability that exactly 4 customers will arrive in a 5-minute span?
Your Answer: 0.0534
15. Question: Attributes control charts:
Your Answer: reduce the need for continuous inspection.
do not differentiate between special causes of variation, if more than one cause exists within a system.
provide an accurate measure of how much a unit varies from the control limits.
do not set upper or lower control limits for data.
16. Question: A firm wants to monitor the number of missed stitches on a line of sweaters being produced. The researchers will construct and use a(n) __________ chart to aid data interpretation.
Your Answer: p chart
17. Question: Data from 30 subgroups of 100 units each yields a total of 150 defective units. What is the upper control limit on the np chart?
Your Answer: 0.70
18. Question: The __________ is used to evaluate the number of nonconformities in a unit.
Your Answer: p chart
19. Question: A sampling process destroys the unit sampled, and because the process is continuous it is possible only to collect one sample at a time. The most appropriate chart to use is a(n):
Your Answer: x-bar chart.
chart for individuals.
20. Question: A firm will use a __________ when measuring nonconformities per unit with variable sample sizes.
Your Answer: p chart
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