Quiz 2A Solutions

Quiz 2A Solutions - Quiz 2A Blue Name

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Unformatted text preview: Quiz 2A Blue Name (print):______________________________________________________ ANSWER SHEET DO NOT WRITE ANYTHING ELSE IN THIS AREA CIRCLE YOUR ANSWER 1. A B C D E 2. A B C D E 3. A B C D E 4. A B C D E 5. A B C D E 6. A B C D E 7. A B C D E 8. A B C D E 9. A B C D E 10.A B C D E 11.A B C D E 12.A B C D E 13.A B C D E 14.A B C D E 15.A B C D E 16.A B C D E 17.A B C D E 18.A B C D E 19.A B C D E 20.A B C D E 21.A B C D E 1 22.A B C D E 23.A B C D E 24.A B C D E 25.A B C D E A manufacturing company measures the weight of boxes before shipping them to the customers. If the box weights have a population mean and standard deviation of 90 lbs. and 24 lbs. respectively, then based on a sample size of 36 boxes, the probability that the average weight of the boxes will: 1. Exceed 94 lbs. is: A) 15.87% B) 16.87% C) 34.13% D) 56.36% E) 84.13% Answer: A: 15.87% 2. The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are current (between 0 and 60 days after billing). The historical records show that over the past 8 years 70 percent of the accounts have been current. Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company. A) 632 B) 897 C) 1267 D) 1548 E) 1842 Answer: D: 1548 Use the following information to answer questions 3-5: The average customer waiting time at a fast food restaurant has historically been 7.5 minutes. The manager claims that the use of a new cashier system will decrease average customer waiting time in the store. 2 3. What are the null and alternative hypotheses for this scenario? A) H : = 7.5 and H A 7.5 B) H : 7.5 and H A > 7.5 C) H : 7.5 and H A < 7.5 D) H : < 7.5 and H A 7.5 E) H : > 7.5 and H A 7.5 Answer: C 4. Based on a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and the standard deviation is 2 minutes per customer. What is the value of the test statistic? A) t = -2.4 B) t = -1.2 C) t = -0.6 D) t = 2.4 E) t = 9.6 Answer: A: t = -2.4 5. Based on a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and the standard deviation is 2 minutes per customer. What is the p-value? A) 0.0000 B) 0.0082 C) 0.0164 D) 0.1151 E) 0.2302 Answer: B: 0.0082 or Answer: C: 0.0164 6. A confidence interval increases in width as A) The level of confidence increases B) n decreases C) s increases D) All of the above E) None of the above 3 Answer: D...
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Quiz 2A Solutions - Quiz 2A Blue Name

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