AP Stats Unit 8

What is the population?

The total number of objects to ever exist; more than the sample shown

What is the sample?

The number of objects presented in the problem

Parameter

(p), the true proportion of objects in the problem \

Statistic

(p hat), proportion of objects from the larger sample (shown as a percentage or fraction; point estimate)

Margin of error

How to find the true proportion (parameter, p) of the data

point estimate (statistic, p hat) +/- margin of error

What is the confidence interval?

The mean of your estimate plus and minus the variation in that estimate

What is the confidence level?

Another way to describe probability

How to interpret the confidence interval

“We are __% confident that the interval from (A) to (B) captures the true (context of the problem)” (states all values A-B are plausible)

How to interpret the confidence level

“If we take many, many samples and calculate a confidence interval for each, about __% of them will capture the (parameter context of the problem)”