Chapter 8 - Probability - Multiple Choice Questions

Chapter 8 - Probability - Multiple Choice Questions



1. If I calculate the probability of an event and it turns out to be -.7, I know that A. the event is probably going to happen.
B. the event is probably not going to happen.
C. the probability of it not happening is .3.
D. I made a mistake.



2. If I flip a fair coin 10 times, which of the following is true? A. The number of heads will equal the number of tails.
B. The probability of all heads is greater than the probability of all tails.
C. The probability of HHHHHHHHHH = the probability of HTHTHTHTHT.
D. The probability of HHHHHHHHHH < the probability of HTHTHTHTHT.



3. Which of the following facts does a person ignore when they reason with the gambler's fallacy? A. Probabilities describe outcomes over the very long term.
B. Extreme outcomes are always counteracted by equally extreme opposite outcomes.
C. The likelihood of the winning depends on the other players.
D. Only fair dice are used at gambling casinos.



4. Which of the following are likely to be dependent events? A. the weather and the number of books on your shelf
B. the color of your car and its gas mileage
C. the weight of your car and its gas mileage
D. the size of your house and the size of your shoes



5. If I sample with replacement, which of the following may be true? A. The numerator for the next event's probability changes.
B. The denominator for the next event's probability changed.
C. Both the numerator and denominator for the next event's probability change.
D. None of the values used in calculating the next event's probability change.



6. If I am selecting subjects to be in my study, I necessarily must do sampling without replacement (I can not have the same person in my study twice). What effect does this have on the sample selection process? A. All subject selection is random.
B. Subjects can no longer be chosen randomly.
C. Each time I select a subject, the people remaining in the subject pool have less of a chance of getting picked.
D. Each time I select a subject, the people remaining in the subject pool have more of a chance of getting picked.



7. I know that if I draw a single card from a deck, it can not be a red card and a black card because these are A. colors.
B. not in the deck.
C. mutually exclusive.
D. conditional.



8. In studying the services available to homeless people at different shelters, I find that only .05 take advantage of job training. This seems small. I decide to investigate further and I see that of the people who were offered job training .65 accepted it. The value .65 is a A. percentage.
B. small number.
C. conditional probability.
D. mutual exclusion.



9. The weight of US Postal Service packages is normally distributed with a mean of 2 oz. and a standard deviation of .5 oz. If I choose two letters from my mail carrier's bag, what is the probability that they will both weigh less than 1 oz.? A. .0005
B. .0228
C. .0456
D. .4772



10. What does a p-value tell you? A. the likelihood of the results obtained in a study deviating from a conservative expectation of no difference
B. if you have conducted your study correctly
C. if you can use the binomial distribution to calculate your probabilities
D. the likelihood that you are correct



11. Multiple- Question Scenarios I tell students in my class that, although I use an average to calculate their course grades, I do weigh the final exam grade more heavily. I assure them that if they can perform well on my final, then even if they performed poorly on the other exams, they must have learned the material. For three semesters I kept track of how people did on the final and how they did in the course.

Using the given data, answer the following question.

COURSE
 PassFail 
FINAL   
Pass14234 
Fail8956 

What is the probability that a student, taken at random from my class, would have passed my course?

A. .72
B. .61
C. .44
D. .55



12. Multiple- Question Scenarios I tell students in my class that, although I use an average to calculate their course grades, I do weigh the final exam grade more heavily. I assure them that if they can perform well on my final, then even if they performed poorly on the other exams, they must have learned the material. For three semesters I kept track of how people did on the final and how they did in the course.

Using the given data, answer the following question.

COURSE
 PassFail 
FINAL   
Pass14234 
Fail8956 

What is the probability that a student, taken at random from my class, would have passed the final?

A. .72
B. .61
C. .44
D. .55



13. Multiple- Question Scenarios I tell students in my class that, although I use an average to calculate their course grades, I do weigh the final exam grade more heavily. I assure them that if they can perform well on my final, then even if they performed poorly on the other exams, they must have learned the material. For three semesters I kept track of how people did on the final and how they did in the course.

Using the given data, answer the following question.

COURSE
 PassFail 
FINAL   
Pass14234 
Fail8956 

What is the probability that a student, taken at random from my class, would have passed the class and the final?

A. .72
B. .61
C. .44
D. .55



14. Multiple- Question Scenarios I tell students in my class that, although I use an average to calculate their course grades, I do weigh the final exam grade more heavily. I assure them that if they can perform well on my final, then even if they performed poorly on the other exams, they must have learned the material. For three semesters I kept track of how people did on the final and how they did in the course.

Using the given data, answer the following question.

COURSE
 PassFail 
FINAL   
Pass14234 
Fail8956 

What is the probability that a student, taken at random from my class, would have passed the class, given that they failed the final?

A. .72
B. .61
C. .44
D. .55



15. I tell students in my class that, although I use an average to calculate their course grades, I do weigh the final exam grade more heavily. I assure them that if they can perform well on my final, then even if they performed poorly on the other exams, they must have learned the material. For three semesters I kept track of how people did on the final and how they did in the course.

Using the given data, answer the following question.

COURSE
 PassFail 
FINAL   
Pass14234 
Fail8956 

What is the probability that a student, taken at random from my class, would have failed the class, given that they failed the final?

A. .72
B. .61
C. .44
D. .39

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