Intro to Confidence Intervals Review

A recent survey asked a random sample of US teens if they text and drive. Based on the sample, the 95% confidence interval for the true proportion of teens who text and drive is (0.233, 0.456). Interpret the confidence interval.

• We are 95% confident that the interval from 0.233 to 0.456 captures the true proportion of teens that text and drive.

• There is a 95% chance that the interval from 0.233 to 0.456 captures the true proportion of teens that text and drive

• 95% of teens text and drive.

• 95% of the intervals from 0.233 to 0.456 capture the true proportion.

Tags

CCSS.HSS.IC.B.4

A recent survey asked a random sample of U.S. teenagers if they text and drive. Based on the sample, the 95% confidence interval for the true proportion of teens who text and drive is (0.233, 0.456). Calculate the point estimate.

• 0.3445

• 0.1115

• 0.223

• 1

Tags

CCSS.HSS.IC.B.4

A recent survey asked a random sample of U.S. teenagers if they text and drive. Based on the sample, the 95% confidence interval for the true proportion of teens who text and drive is (0.233, 0.456). Calculate the margin of error.

• 0.3445

• 0.1115

• 0.223

• 1

Tags

CCSS.HSS.IC.B.4

A recent survey asked a random sample of U.S. teenagers if they text and drive. Based on the sample, the 95% confidence interval for the true proportion of teens who text and drive is (0.233, 0.456). Based on this interval, is it possible that 50% of teens text and drive?

• Yes

• No

• We don't have enough information.

Tags

CCSS.HSS.IC.B.4

A recent survey asked a random sample of U.S. teenagers if they text and drive. Based on the sample, the 95% confidence interval for the true proportion of teens who text and drive is (0.233, 0.456). Interpret the confidence level.

• If we were to select many random samples and construct a confidence interval for each, about 95% of the intervals would capture the true proportion.

• There is a 95% chance that we have captured the true proportion.

• We are 95% confident that the interval from 0.233 to 0.456 captures the true proportion.

• 95% of teens text and drive.

Tags

CCSS.HSS.IC.B.4

How do we decrease the margin of error?

• Use a smaller sample size

• Use a larger sample size

• Increase our confidence level

• Increase our interval.

Tags

CCSS.HSS.IC.B.4

How do we decrease the margin of error?

• Use a smaller sample size

• Decrease our confidence level

• Increase our confidence level

• Increase our interval.

Tags

CCSS.HSS.IC.B.4

A random sample of 100 adults are asked if they pay for monthly subscriptions that they do not use. Many do, because they have never taken the time to cancel the subscription. A 95% confidence interval for the proportion of adults who do pay for subscriptions they do not use is 0.352 to 0.548. Interpret the confidence interval.

• We are 95% confident that the interval from 0.352 to 0.548 captures the true proportion of adults who pay for subscriptions they do not use.

• There is a 95% probability that the interval from 0.352 to 0.548 captures the true proportion of adults who pay for subscriptions they do not use.

• If we took many samples and created confidence intervals, 95% of them would capture the true proportion.

• We are 95% confident that our interval captures the true mean.

Tags

CCSS.HSS.IC.B.4

A random sample of 100 adults are asked if they pay for monthly subscriptions that they do not use. Many do, because they have never taken the time to cancel the subscription. A 95% confidence interval for the proportion of adults who do pay for subscriptions they do not use is 0.352 to 0.548. Calculate the point estimate.

• 0.098

• 0.196

• 0.45

• 0.5

Tags

CCSS.HSS.IC.B.4

A random sample of 100 adults are asked if they pay for monthly subscriptions that they do not use. Many do, because they have never taken the time to cancel the subscription. A 95% confidence interval for the proportion of adults who do pay for subscriptions they do not use is 0.352 to 0.548. Calculate the margin of error.

• 0.45

• 0.196

• 0.098

• 0.5

Tags

CCSS.HSS.IC.B.4