Questions:

35

Based on experience, 60 percent of the women who request a pregnancy test at a certain clinic are actually pregnant. In a random sample of 12 women, what is the probability that at least 10 are pregnant?

a.

.0639

b.

.1424

c.

.0196

d.

.0834

36

Stem-and-leaf displays, dot plots, and histograms can all be used to show skewness in a distribution.

Select one:

True

False

37

Regarding the rules of probability, which of the following statements iscorrect?

a.

IfAandBare independent events, thenP(B) =P(A)P(B).

b.

The probabilities of mutually exclusive events sum to one.

c.

The probability of A or its complement equals one.

d.

If eventAoccurs, then its complement will also occur.

38

A large number of applicants for admission to graduate study in business are given an aptitude test. Scores are normally distributed with a mean of 460 and standard deviation of 80. The top 2.5 percent of the applicants would have a score of at least (choose the nearest integer)

a.

606.

b.

617.

c.

600.

d.

646.

39

A large number of applicants for admission to graduate study in business are given an aptitude test. Scores are normally distributed with a mean of 460 and standard deviation of 80. The top 2.5 percent of the applicants would have a score of at least (choose the nearest integer)

a.

606.

b.

617.

c.

600.

d.

646.

40

Arandom sampleis one in which the

a.

probability that an item is selected for the sample is the same for all population items.

b.

population items are selected haphazardly by experienced workers.

c.

items to be selected from the population are specified based on expert judgment.

d.

probability of selecting a population item depends on the item's data value.

41

The random variableXis normally distributed with mean of 80 and variance of 36. The 67th percentile of the distribution is

a.

72.00.

b.

95.84.

c.

90.01.

d.

82.64.

42

For a sample size(n) of 50, which distribution is most strongly right-skewed?

a.

binomial with= .70

b.

binomial with= .90

c.

binomial with= .40

d.

binomial with= .10

43

Which shouldnotbe regarded as a continuous random variable?

a.

tonnage carried by a randomly chosen oil tanker at sea

b.

wind velocity at 7 o'clock this morning

c.

number of personal fouls by the Miami Heat in a game

d.

length of time to play a Wimbledon tennis match

44

A parameter is a measure that describes a sample.

Select one:

True

False

45

Excel's rotated 3D bar charts charts

a.

are generally preferred to plain 2D charts.

b.

should be avoided despite their visual appeal.

c.

are generally preferred to line charts.

d.

show data values more clearly than column charts.

46

The mean, median, and mode of a normal distribution will always be the same.

Select one:

True

False

47

Which statement concerning the binomial distribution iscorrect?

a.

Its PDF covers all integer values ofXfrom 0 ton.

b.

Its PDF is the same as its CDF when= .50.

c.

Its CDF shows the probability of each value ofX.

d.

Its CDF is skewed right when< .50.

48

A charity raffle prize is $1,000. The charity sells 4,000 raffle tickets. One winner will be selected at random. At what ticket price would a ticket buyer expect to break even?

a.

$0.50

b.

$0.25

c.

$0.75

d.

$1.00

49

Which of the following is the sample space describing the number of cracked eggs in a full dozen carton?

a.

S= {1, 2, 3, ...}.

b.

S= {1, 2, 3, ..., 11, 12}.

c.

S= {0, 1, 2, 3, ....}.

d.

S= {0, 1, 2, 3, ..., 11, 12}.

50

If GMAT scores for applicants at Oxnard Graduate School of Business areN(500, 50), then the top 5 percent of the applicants would have a score of at least (choose the nearest integer)

a.

575.

b.

582.

c.

601.

d.

608.