North Carolina Math 3 EOC Chapter 13

DOK: 2
1 pt

1.

You are told that the interval that is most likely to contain all the people who walk their dog every day is between 13.5% and 22.1%. What is the margin of error, and what sample size is needed to obtain that margin of error?

A

±4.3%; 32

B

±17.8%; 541

C

±4.3%; 541

D

±17.8%; 32

DOK: 2
1 pt

2.

A recent survey showed that 40% of people like country music. You conduct a random survey of 10 people. What is the approximate probability that at most 3 people like country music?

A

0.4167

B

0.3446

C

41=67%

D

Cannot be approximated because np < 5 and n (1 – p) > 5.

DOK: 1
1 pt

3.

You are having people stand in a line and numbering them 1, 2, 1, 2, 1.... You are only interested in surveying the people who are numbered 1. What kind of sample are you taking?

A

Self-selected Sample.

B

Systematic Sample.

C

Random Sample.

D

Convenience Sample.

DOK: 2
1 pt

4.

In a recent survey of 160 people, 31% said that they spend at least $50 a day on everyday expenses. What is the margin of error for this survey?

A

about 7.91%

B

about 0.079%

C

about 0.625%

D

about 14.20%

DOK: 1
1 pt

7.

You go to a subway station and pick out 50 random people to ask them if they use the subway as their main mode of transportation. What type of sample are you taking?

A

Self-selected Sample.

B

Systematic Sample.

C

Random Sample.

D

Convenience Sample.