North Carolina Math 3 EOC Chapter 13

### North Carolina Math 3 EOC Chapter 13 Sample

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?

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?

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?

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?

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?