Mixed Practice for Stats

What kind of sampling technique is the following:

List the names of all the students alphabetically and contact the parent of every 25th student.

• Convenience Sampling

• Simple Random Sampling

• Systematic Sampling

• Sample

What kind of sample technique is the following:

Survey 130 names chosen out of a hat.

• Convenience Sampling

• Simple Random Sampling

• Systematic Sampling

• Sample

What kind of sample technique is the following:

Question everyone in the cafeteria.

• Convenience Sampling

• Simple Random Sampling

• Systematic Sampling

• Sample

A beverage company wanted to see if people in the United States liked their new logo. Which choice best represents a population?

• A selection of logo artists.

• Every person in the United States.

• A selection of shoppers from different states.

• 3,800 children age 5 - 15

A musician wanted to see what people who bought his last album thought about the songs. Which choice best represents a sample? .

• Every person who bought the album.

• A selection of people who didn't want to buy the album.

• 250 girls who bought the album

• A selection of 3,294 people who bought the album.

A study was commissioned to find the average water bill of a particular town.

The confidence interval created was between $44-$56.

What was the average of the sample?

• $44

• $50

• $52

• $54

A study by the department of education in a certain state found that there was a mean SAT score of 534 with a margin of error of 20.

Which score(s) would fall outside the confidence interval?

• 505

• 530

• 550

• 558

A study by the department of education in a certain state found that there was a mean SAT score of 534 with a margin of error of 20.

Create a confidence interval for the true mean.

• (534, 554)

• (514, 534)

• (514, 554)

• (524,554)

Determine whether the action would increase or decrease the margin of error:

Increase the sample size

• Margin of error increases

• Margin of error decreases

Determine whether the action would increase or decrease the margin of error:

Decrease the sample size

• Margin of error increases

• Margin of error decreases