Unit 5 Quiz 1

What value is captured by confidence intervals

The population proportion

What is the best interpretation of the interval

We are __% confident that the interval _ to _ captures the true proportion of ________

Margin of Error

(B-A)/2

Point Estimate

(A+B)/2

If the confidence interval decreased, how would this affect the interval width?

The width of the interval would decrease. A smaller confidence interval would be less likely to capture the true proportion, so the interval would be narrower

If the sample size increases, how would this affect the interval?

The width of the interval would decrease. Increasing the sample size decreases the margin or error, which narrows the confidence level

Interpret the Confidence Level

If we take many, many samples and calculate a confidence interval for each, about ___% of them will capture the [context]

Margin of Error accounts for

Sampling variability

Plausible

Values within the confidence interval

If the confidence interval increased, how would this affect the interval width?

The interval width would be increased as margin of error increases