AP statistics chapter 19 by Stats modelling the world third edition by David E. Bock

● A confidence interval that estimates what proportion of a population has a certain characteristic. The confidence interval is not certain, just an inferred estimate. 90%, 95%, and 99% are common confidence levels.

● A ***z interval*** is a specific type of ***confidence interval*** which tells you a range where you can expect a particular mean or proportion to fall.

● The ***margin of error*** is a statistic expressing the amount of random sampling error in the results of a survey. 

● A critical value is the value of the test statistic which defines the upper and lower bounds of a confidence interval, or which defines the threshold of statistical significance in a statistical test

● The ***standard error*** of a statistic is the ***standard deviation*** of its sampling distribution or an estimate of that ***standard deviation***.

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