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SusanAthena
SusanAthena, Master's Degree
Category: Math Homework
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11. Your rating of the food served on your most recent airline

This answer was rated:

11. Your rating of the food served on your most recent airline flight (using a scale of 0 = gross, 1 = decent, 2 = yummy) is ___________ data.

A) nominal

B) ordinal

C) interval

D) ratio

12. Sampling error can be reduced by

A) increasing the sample size.

B) decreasing the sample size.

C) utilizing simple random samples.

D) none of the above.

13. Before deciding whether to assess heavy fines against noisy airlines, which sampling method would the Federal Aviation Administration probably use to estimate the mean peak noise from departing jets as perceived by ground-level observers at a point one mile from the end of the departure runway?

A) Radio survey of the pilots.

B) Simple random sample.

C) Systematic sample.

D) Cluster sample.

14. Histograms do not reveal the

A) exact data range.

B) modal class(es).

C) degree of skewness.

D) relative frequencies.



15. Chebyshev's theorem says that at least 95% of the data lies within 2 standard deviations of the mean.

A) True

B) False

16. Standardized data will always have a mean of 0 and a standard deviation of 1 regardless of ? and ?.

A) True

B) False

17. Which is a characteristic of the mean as a measure of central tendency?

A) Deviations do not to sum to zero when there are extreme values.

B) Is less reliable than the mode when data are continuous.

C) Utilizes all the information in a sample.

D) Is usually equal to the median in samples of business data.

18. Consider the following data: 6, 7, 17, 51, 3, 17, 23, and 69. The range and the median are:

A) 69 and 17.5

B) 66 and 17.5

C) 66 and 17

D) 69 and 17

19. A population consists of the following data: 7, 11, 12, 18, 20, 22, 25. The population variance is

A) 6.07
B) 36.82
C) 5.16
D) 22.86
20. Use the following scenario to answer questions 12 to 15. Twelve randomly-chosen students were asked how many times they had missed class during a certain semester, with
Thank you so much for requesting me!

Your answer is below.

Kind regards,
Susan

11. B) ordinal

12. A) increasing the sample size.

13.D) Cluster sample.

14. A) exact data range.

15. B) False

16. A) True

17. C) Utilizes all the information in a sample.

18 C) 66 and 17

19. B) 36.82
Customer: replied 7 years ago.
Can you help me with the rest of my questions and I will give you a bigger tip.

20. Use the following scenario to answer questions 12 to 15. Twelve randomly-chosen students were asked how many times they had missed class during a certain semester, with this result: 2, 1, 5, 1, 1, 3, 4, 3, 1, 1, 5, 18.
For this data set the geometric mean is

•A) 2.376

•B) 2.158

•C) 1.545

•D) None of these.


21. Use the following scenario to answer questions 12 to 15. Twelve randomly-chosen students were asked how many times they had missed class during a certain semester, with this result: 2, 1, 5, 1, 1, 3, 4, 3, 1, 1, 5, 18.
For this sample, the standard deviation is approximately

•A) 4.75

•B) 4.55

•C) 3.03

•D) 3.75

22. The probability of an event will always be a value greater than zero, but less than or equal to one.

•A) True

•B) False


23. If events A and B are mutually exclusive, then P(A) + P(B) = 0.

•A) True

•B) False


24. Two events A and B are independent only if the P(A | B) is the same as the P(A).

•A) True

•B) False

25. Independent events A and B would be consistent with which of the following statements:

•A) P (A) = .5, P (B) = .4, P (A ∩ B) = .3

•B) P (A) = .4, P (B) = .3, P (AB) = .5

•C) P (A) = .3, P (B) = .5, P (AB) = .4

•D) P (A) = .4, P (B) = .5, P (AB) = .2

26. If each of two independent file servers has a reliability of 93% and either alone can run the web site, then the overall web site availability is

•A) 0.8649

•B) 0.8649

•C) 0.9522

•D) 0.9951

27. The manager of a Drug Store knows that 50% of the customers entering the store buy prescription drugs, 65% buy over-the-counter drugs, and 18% buy both types of drugs. What is the probability that a randomly selected customer will buy at least one of these two types of drugs?

•A) .5

•B) .85

•C) .97

•D) 1.0

 

Use the following table for problems28 through 30

County

Sprint (S)

AT&T (A)

Virgin (V)

Row Total

Macomb (M)

17

25

8

50

Oakland (O)

19

38

13

70

Wayne (W)

24

37

19

80

Col Total

60

100

40

200

28. P(V') is approximately

•A) .20

•B) .40

•C) .50

•D) .80


29. P(SW) is approximately

•A) .12

•B) .30

•C) .40

•D) .58


30. P(M U A) is approximately

•A) .25

•B) .50

•C) .625

•D) .125

Oh, I see that you've already posted half of these to another expert. Would you like me to go ahead with 25 through 30?

Kind regards,
Susan
Customer: replied 7 years ago.
Yes, sorry about that, I was under the impression you were not going to answer the second part of my questions #20-30. Please proceed, I will wait on your responce. Thanks.
OK. no problem. Sorry, I got tied up with something else, but I'm on it now.

krs
Thank you for your patience. Your answers are below.

Kind regards,
Susan


25. D) P (A) = .4, P (B) = .5, P (A ∩ B) = .2

26. D) 0.9951

27. C) .97

28. A) .20

29. A) .12

30. C) .625
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