1. (TCO 9) The hours of study and the final exam grades havethis type of relationship:
天 = 5.76(hours) + 35.31. Based on this linear regression equation,estimate the expected grade for a student spending 8 hoursstudying. Round your answer to two decimal places. (Points : 6)
46.08
81.39
91.45
85.29
2. (TCO 5) Historical sales records show that 40% of all customerswho enter a discount department store make a purchase. We areinterested in calculating the probability that 3 of 5 customersmake purchase. Choose the best answer of the following: (Points :6)
This is an example of a Poisson probability experiment
This is an example of a Binomial probability experiment
This is neither a Poisson nor a Binomial probability experiment
Not enough information to determine the type of experiment
3. (TCO 5) Microfracture knee surgery has a 75% chance of successon patients with degenerative knees. The surgery is performed on 5patients. Find the probability of the surgery being successful onmore than 3 patients? (Points : 6)
0.487304
0.367188
0.632813
0.762695
4. (TCO 5) It has been recorded that 10 people get killed by sharkattack every year. What is the probability of having 5 or 6 peopleget killed by shark attack this year? (Points : 6)
0.130141
0.026484
0.100889
0.067086
5. (TCO 2) The mean teaching hours for a full time faculty at astate university is eight hours per week. What does this tell youabout the typical teaching hours for full time faculty at thatuniversity? (Points : 6)
Half the full time faculties teach less than eight hours per weekwhile half teaches more than eight hours per week.
The average teaching hours for full time faculty is eight hours perweek.
More full time faculty teaches eight hours per week than any othernumber of teaching hours.
The number of teaching hours for full time faculty in not veryconsistent because eight is such a low number.
6. (TCO 6) Assuming that the data are normally distributed with amean of 45 and a standard deviation of 3.25, what is the z-scorefor a value of 40? (Points : 6)
1.54
2.38
-1.36
-1.54
7. (TCO 8) The mean hours of Internet usage by adults in the US inclaimed to be 25 hours per week. A hypothesis test is performed ata level of significance of 0.05 with a P-value of 0.01. Choose thebest interpretation of the hypothesis test. (Points : 6)
Reject the null hypothesis; there is enough evidence to reject theclaim that the mean of hours Internet usage by adults in the US is25 hours per week.
Reject the null hypothesis; there is enough evidence to support theclaim that the mean hours Internet usage by adults in the US is 25hours per week.
Fail to reject the null hypothesis; there is not enough evidence toreject the claim that the mean hours of Internet usage by adults inthe US is 25 hours per week.
Fail to reject the null hypothesis; there is not enough evidence tosupport the claim that the mean hours of Internet usage by adultsin the US is 25 hours per week..
8. (TCO 8) A result of an entry level exam reveals that more than22% of students fail that exam.
In a hypothesis test conducted at a level of significance of 2%, aP-value of 0.035 was obtained. Choose the best interpretation ofthe hypothesis test. (Points : 6)
Fail to reject the null hypothesis; there is not enough evidence toreject the claim that 22% of students fail the entry levelexam.
Fail to reject the null hypothesis; there is not enough evidence tosupport the claim that 22% of students fail the entry levelexam.
Reject the null hypothesis; there is enough evidence to reject theclaim that 22% of students fail the entry level exam.
Reject the null hypothesis; there is enough evidence to support theclaim that 22% of students fail the entry level exam.
9. (TCO 2) Having two types of cars called type A and type B. Inobserving the miles per gallon we found that both types make meanmiles per gallon of 32. Car A has a standard deviation of 5 milesper gallon while car B has a standard deviation of 3 miles pergallon. Which of the two car types is more consistent in fuelconsumption? (Points : 6)
Type A car because it got more fuel consumption consistency.
Type B car because it got more fuel consumption consistency.
Either car type because their average fuel consumption is thesame.
Neither car type because the given information is not enough tomake a decision
10. (TCO 4) A jar contains balls of four different colors; red,blue, yellow and green. The total balls are divides as 40% red, 30%blue, 20% yellow, and 10% green. If you are to select one ball atrandom. Find the expected value of your winning amount if thepayments are set to be $5, $10, $20, $50
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