uestion #1 / 20

Which of the following variables are best thought of as continuous, which discrete?

Indicate your choice for each by checking the appropriate column.

Variable

(a) The cranial capacity (space inside the skull) of

a human skull

Discrete

Continuous

(b) The body weight of a preschool child

(c) The number of children in a household

(d) The length of the arm of a heavyweight boxer

Question #2 / 20

The stemandleaf display below gives the test scores for the

students in Prof.

Yang’s management class. Use the display to answer the following questions.

Test scores

Key:

means a score of

.

(a)

What was the lowest score

overall?

(b)

What was the highest score in

the 80s?

(c)

How many students scored in

the 90s?

Question #4 / 20

The citizens of a certain community were asked to choose their favorite pet. The pie

chart below shows the distribution of the citizens’ answers. If there are

in the community, how many chose Fish or Dogs?

citizens

Hamsters

6%

Snakes

10%

Cats

24%

Birds

21%

Dogs

25%

Fish

14%

Question #6 / 20

Adults who are being tested for dementia are asked to perform mental tasks such as

listing as many animals as they can in one minute. Here are the numbers of animals

listed in one minute by normal (nondemented) adults:

19, 11, 15, 12, 18, 25, 13, 22

(a) What is the median of this data set? If your answer is not an integer, round your answer to at least

one decimal place.

(b) What is the mean of this data set? If your answer is not an integer, round your answer to at least

one decimal place.

(c) How many modes does the data set have, and what are their values? Indicate the number of modes

by clicking in the appropriate circle, and then indicate the value(s) of the mode(s), if applicable.

zero modes

one mode:

two modes:

,

Question #15/ 20

Of the people who fished at Clearwater Park today,

had a fishing license, and did

not. Of the people who fished at Mountain View Park today,

not. (No one fished at both parks.)

had a license, and did

Suppose that one fisher from each park is chosen at random. What is the probability

that the fisher chosen from Clearwater did not have a license and the fisher chosen

from Mountain View had a license?

Do not round your answer.

Question #16 / 20

Ed’s Tires and Brakes has two locations, one on the northwest side of town and one on

the southeast side of town. At both locations are performed routine tire repairs and

rotations, as well as expensive brake repairs. This past week,

of the cars serviced

at Ed’s were serviced at the northwest location, while

of the cars were serviced at

the southeast location. (No car was serviced at both locations.) Brake repairs were

more typical at the northwest location than at the southeast location:

of the cars at

the northwest location required brake repairs, while

location required brake repairs.

Let

of the cars at the southeast

denote the event that a randomly chosen car (taken to Ed’s in the past week) was

serviced at the northwest location and

denote the event that a randomly chosen car

was serviced at the southeast location. Let denote the event that a randomly chosen

car required brake repairs and denote the event that a randomly chosen car did not

require brake repairs.

Fill in the probabilities to complete the tree diagram below, and then answer the

question that follows. Do not round any of your responses.

=P B N

0.5

=P ∩N B

=P N

0.6

=P ∩N B

=P B N

=P B N

=P ∩N B

=P N

=P ∩N B

=P B N

0.65

What is the probability that a randomly chosen car did not

require brake repairs?

Question #17 / 20

An employer interviews people for computer programming positions in a company,

and of the people are men. If all are qualified, in how many ways can the

employer fill the computer programming positions if exactly are men?

Question #19 / 20

A survey of a sample of

people is conducted. The survey’s respondents are

classified according to their political affiliation and their opinion on a bill. The results are

given in the contingency table below.

Opinion on the bill

In favor of Opposed to Indifferent to

Democrat

50

41

22

Political affiliation Republican

46

24

31

Independent

49

18

22

What is the relative frequency of respondents who are in favor of the bill?

Round your answer to at least two decimal places.

Question #20 / 20

A department store is holding a drawing to give free shopping sprees to two lucky

customers. There are

customers who have entered the drawing: live in the town of

Gaston, live in Pike, and live in Wells. In the drawing, the first customer will be

selected at random, and then the second customer will be selected at random from the

remaining customers. What is the probability that both customers selected are Gaston

residents?

Report your answer as an exact fraction.