Virtual Course MATH 250 Elements of Statistics

Multiple Choice

. Choose the one best answer, placing that answer to the left of the question's number

. Work should be shown out to the right of the question as needed

. Hypothesis testing templates are provided on the next worksheet

. 1

. The editors of Celebrity Statistics magazine wish to determine Americans’ favorite celebrities

. A ballot is included in the November issue of the magazine

. Readers are encouraged to mail in their ballots

. Indicate the population and sample

. A

. Population: Readers of Celebrity Statistics

Sample: Readers who mail in their ballots

B

. Population: Readers who mail in their ballots

Sample: Readers of Celebrity Statistics

C

. Population: Readers who mail in their ballots

Sample: Americans

D

. Population: Americans

Sample: Readers who mail in their ballots

2

. What percent of hospital patients were at most 49 years old?

Ages Frequency

A

. 70

.8% 0-9 3

B

. 60

.4% 10-19 3

C

. 39

.6% 20-29 4

D

. 29

.2% 30-39 4

40-49 5

50-59 7

3

. Within which age group would the third quartile (Q3) fall? 60-69 9

70-79 8

A

. 50-59 80-89 3

B

. 60-69 90-99 2

C

. 70-79

D

. 80-89

4

. Consider the following stem-and-leaf plot displaying ACT scores

. In the plot, 1|2 represents a score of 12

. Which of the following is false with regard to the data in this stem-and-leaf plot?

1 2334

A

. There were 29 pieces of data collected 1 57888899

B

. The range of this data set is 23 2 000112223

C

. The median of this data set is 21 2 55567

D

. The mode for the data set is 18 3 23

3 5

5

. A state politician wants to gauge public opinion in his area before deciding to run for re-election

. For the study, 200 registered voters are chosen at random from each county in his district

. What type of sampling is being utilized?

A

. Cluster Sampling

B

. Stratified Sampling

C

. Systematic Sampling

D

. Simple Random Sampling

The following data shows the weights of 12 randomly selected newborn babies

. 6

.8 9

.1 8

.7 7

.5 8

.2 5

.4 6

.5 8

.5 7

.3 6

.6 5

.9 7

.3

6

. Find the mean and median to the nearest hundredth for this sample data

. A

. mean = 7

.32, median = 7

.30 Mean = 7

.32

B

. mean = 7

.30, median = 7

.32 Median = 7

.30

C

. mean = 7

.50, median = 7

.48

D

. mean = 7

.48, median = 7

.508

7

. Which of the following gives the sample standard deviation and the range of the sample data?

A

. SD: 1

.10; Range: 1

.8 Std Dev = 1

.15

B

. SD: 1

.15; Range: 3

.7 Range = 3

.70

C

. SD: 1

.10; Range: 3

.7

D

. SD: 1

.15; Range: 1

.8

8

. Which one of the following describes a quantitative, continuous variable?

A

. Classification of students (freshman, sophomore, junior, senior)

B

. Lengths of fish caught in a lake

C

. Hair color

D

. Number of students in a class

. Exam Scores for Two 5th Grade Student Groups

9

. Which distribution shape best describes the boxplot for Class 5A?

A

. Bell shaped

B

. Uniform

C

. Skewed right

D

. Skewed left

10

. Which of the following statements is true concerning the box-and-whisker plots?

A

. Class 5A has a larger range than Class 5B

B

. Class 5A has a larger interquartile range (IQR) than Class 5B

C

. Class 5A has a larger median than Class 5B

D

. Class 5A has a larger maximum value than Class 5B

11

. Out of twenty randomly chosen college students, at least 8 owned a tablet

. What is the complement of this description?

A

. Eight or fewer owned a tablet

B

. Fewer than eight owned a tablet

C

. No more than eight owned a tablet

D

. Eight or more owned a tablet

12

. If P(A)=0

.03, which one of the following statements is false?

A

. The probability of the complement of A is 0

.97

. B

. The probability of event A happening twice in a row (with replacement) is 0

.0009

. C

. Event A is an “unusual” event

D

. For each 3 times event A happens, there are 100 times in which A doesn’t happen

. 13

. A bag contains 3 red marbles, 9 blue marbles, and 5 green marble

. If you draw two marbles, one right after the other and without replacement, what is the probability that they will both be blue?

A

. (9/17) * (8/16)

B

. (9/17) + (8/16)

C

. (9/17) * (8/17)

D

. (9/17) + (8/17)

The following table is the probability distribution for the number of courses taken by FHSU students in a certain semester

. In the table, x = the number of courses taken, and P(x) = the probability of taking x courses

. 14

. The probability that a randomly selected student takes at least 3 courses is:

A

. 0

.151

B

. 0

.249

C

. 0

.600

D

. 0

.849

15

. Determine the expected number (mean) of courses taken by students

. A

. 0

.2

B

. 0

.7

C

. 3

.0

D

. 3

.5

16

. 40% of all people have blood type A

. What is the probability of randomly selecting 2 people and neither of them has blood type A?

A

. 1

.20

B

. 0

.80

C

. 0

.36

D

. 0

.16