Statistics Review

Unit 6 Review

Statistics

Multiple Choice

Complete the following statement about the change in size.

If you increase the size of your sample, the margin of error will . . . .

• increase

• decrease

• stay the same

Multiple Choice

A research team surveys 1001 adults, asking them how many hours they work per week. What is the margin of error for this survey?

• 3%

• 32%

• 63%

• 9%

Multiple Choice

A research team surveys 200 high schoolers at EWHS. They find that 57% of them drive to school every day. What is the margin of error?

• 95%

• 14%

• 7%

• 3%

Multiple Choice

Why is a sample of 1000 people better than a sample of 100 people?

• It reduces the margin of error.

• It decreases bias.

• Having more people is always better.

• More people means that our results are more accurate.

Multiple Choice

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

• 89% - 91%

• 87% - 89%

• 87% - 91%

• 388 - 402

Multiple Choice

A newspaper asks its readers to call in and answer the following question, "Are young adults unprepared for college?" What type of sample is this?

• Convenience Sample

• Random Sample

• Voluntary Response Sample

• Call in sample

Multiple Choice

A representative for Macy's walks around the mall interviewing people about their brand perception of Macy's. What kind of sample is this?

• Convenience sample

• random sample

• voluntary response sample

• weighted sample

Multiple Choice

Determine the type of sampling used in the following scenario: Divide the users of the Internet into different age groups and then select a random sample from each age group to survey about the amount of time they spend on the Internet each month.

• Systematic
• Simple Random
• Cluster
• Stratafied

Multiple Choice

Determine the type of sampling used in the following scenario: An orange grower wishes to compute the average yield from his orchard. The orchard contatins 3 varieties: 50% of his trees are variety A, 25% of variety B, 25% of variety C. Suppose that the grower selects for his sample a 10 by 30 rectangular block of 300 trees of variety A, a 10 by 15 block of 150 B trees, and a 10 by 15 block of 150 C trees. What type of sampling is being used?

• Stratified Sampling
• Cluster Sampling
• Simple Random Sampling
• Convenience Sampling

Multiple Choice

Identify the sampling design: WCPSS wants to survey its employees. They pick 15 schools from the county and survey every single employee in each of the 15 buildings.

• cluster

• volunteer

• systematic

• simple random

Multiple Choice

Identify each of the following as an observational study or an experiment.

Compare the grades on a final math test of 25 students who use calculators and 25 students who do not use calculators. The students decide which group they are in.

• Observational Study

• Experiment

Multiple Choice

You want to find opinions on the best computer game to buy.

• survey

• observational study

• experiment

Multiple Choice

A Parks Department employee wants to know if latex paint is more durable than non-latex paint. She has 50 park benches painted with latex paint and has 50 park benches painted with non-latex paint.

• Experiment

• Survey

• Observational study

Multiple Choice

The statistic is a number describing the:

• population

• sample

• survey

• percent

Multiple Choice

The parameter is a number describing the:

• population

• sample

• survey

• percent

Multiple Choice

Many years ago, a New York Times Poll on women’s issues interviewed 1025 women randomly selected from the United States, excluding Alaska and Hawaii. One question was “Many women have better jobs and more opportunities than they did 20 years ago. Do you think women had to give up too much in the process, or not?” 48% of women in the sample said “Yes.”

What is the sample size for this survey?

• 1025

• American Adult Women

• American Adults

• 48%