AP Statistics Chapter 8.1 and 8.2

A preliminary study suggests that 17% of people agree on an issue. How large must your sample size be so you could be within ± 5% with 95% confidence?

• 217

• 30

• 2

• 152

Find the critical value, z*, for 91% confidence.

• 1.70

• 1.34

• 0.18

• -1.34

For a sample, the 95% confidence interval is (0.202, 0.482).

What is the point estimate, p̂, of this sample?

• 0.28

• 0.14

• 0.342

• 0.684

For a sample, the 95% confidence interval is (0.202, 0.482).

What is the margin of error of this sample?

• 0.28

• 0.14

• 0.342

• 0.684

Given the same mean, SD, and sample size, a confidence interval of 80% would be wider than a confidence interval of 90%

• True
• False

What does this symbol represent?

• sample mean
• population standard deviation
• population mean
• sample mew

What does this symbol represent?

• parameter
• sample proportion
• parameter of a population
• population proportion

What does this symbol represent?

• population proportion
• parameter
• sample proportion
• population sample

What does this symbol represent?

• standard error
• standard deviation of the sample proportions
• standard deviation of a parameter
• standard deviation of the population

What does this symbol represent?

• standard deviation of the sample means
• standard deviation of the mean
• standard deviation of the parameter
• standard error