CI for Proportions Practice

Front

What is the formula for a confidence interval for proportions?

Back

Point estimate +/- margin of error.

Front

What does a 95% confidence interval indicate?

Back

There is a 95% chance that the true population parameter lies within the interval.

Front

What is the margin of error in a confidence interval?

Back

The range of values above and below the point estimate that reflects the uncertainty in the estimate.

Front

If a confidence interval is (0.45, 0.59), what can we conclude about the population proportion?

Back

More than 40 percent of the residents support the increase.

Front

How does increasing the sample size affect the confidence interval?

Back

It results in a narrower confidence interval.

Front

What happens to the confidence interval when the confidence level is decreased?

Back

The width of the confidence interval becomes smaller.

Front

What is a point estimate?

Back

A single value estimate of a population parameter, such as the sample proportion.

Front

If the confidence interval for defective manhole covers is (0.035, 0.065), what is the point estimate?

Back

0.05.

Front

What is the effect of using a higher confidence level on the width of the confidence interval?

Back

It increases the width of the confidence interval.

Front

What is the relationship between confidence level and margin of error?

Back

Higher confidence levels result in larger margins of error.