Samples and Populations Mastery Check Study Guide

Mrs. Johnson took out a student loan for her daughter's college education. If she borrows

$16,000 for 4 years at 4.5% interest, how much will she have paid in interest after 2 years?

• $17,440

• $1,440

• $2,880

• $5760

A home improvement store normally sells 24-foot extension ladders for $375. This week

the ladders are discounted by 15%. What is the sale price of the ladders?

• $56.25

• $318.75

• $360.00

• $431.23

A trampoline costs $470 and the sales tax is 7.25%. What is the total cost of the

trampoline?

• $435.93

• $477.25

• $504.08

• $470.07

The local movie theater is planning to show a free movie. They took a random sample of people to find out their favorite type of movie and recorded the results in a graph. What was the size of the sample?

• 20

• 4

• 6

• 10

A random sample of twenty-five seventh-grade students were asked to estimate how many hours a week they spend talking on the phone. This dot plot represents their reported number of hours of phone usage per week. What does each dot represent?

• one student in the sample

• the total number sampled

• the mean of the sample

Andre wants to know how teachers in the local school district generally feel about a proposed plan to change from five day weeks to four day weeks. Which of the following methods will produce a representative sample and therefore provide valid inferences?

• Survey all of the teachers who have publicly protested or supported the proposal.

• Survey the first 50 teachers who arrive at Andre’s school in the morning.

• Survey a random sample of 50 teachers within the school district.

• Survey a random sample of 50 teachers and parents of kids within the school district.

A survey is given on how to improve the school. The survey is given to every 10th student who enters the band room. The survey is​ (a)   because it ​ (b)   representative of the population.

• biased
• unbiased
• is
• is not

A school district wants to estimate the number of middle school students that ride the

bus to school. What sample is unbiased?

• Randomly asking 100 seventh grade students.

• Randomly asking 100 students in art class.

• Randomly asking 100 students in the cafeteria.

• Randomly asking 100 students who play basketball.

A politician is running for a state representative position. He wants to know what his

chances of winning are.

Which method is most likely to give a random sample of voters?

• Survey people who volunteer at political events.

• Survey people from several different counties throughout the state.

• Survey college students at the local university.

• Survey senior citizens at the local community center.

A middle school with 1,800 students is considering changing the cafeteria menu. The

school plans to first find out which meals the students prefer.

Which would be the BEST method for obtaining the information?

• Survey every parent in the car rider line one afternoon

• Conduct a survey of all the parents at the school

• Ask students to fill out a survey on the school's website

• Survey every tenth student who enters the school