Cumulative review transfer item: In AP Stats, this item is specifically about Exploring One-Variable Data: exploring data, collecting data, probability, inference. A response about exam-style reasoning says, "The data proves the treatment works." What is the best AP-style revision? State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In AP Stats, this item is specifically about Exploring Two-Variable Data: scatterplot form, least squares line, residuals, outliers and leverage. Which written answer would most likely earn communication credit on an AP Statistics free-response question about Exploring Two-Variable Data? Provide a concise written explanation.

Cumulative review transfer item: In AP Stats, this item is specifically about Collecting Data: population vs sample, random sampling, bias and confounding, observational studies vs experiments. In Collecting Data, a student confuses a parameter with a statistic. Which correction is most accurate? State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In a probability and random-variable setting, use sample space, conditional probability, independence, expected value, binomial model, and distribution interpretation. The heights of plants are normally distributed with $\mu=150$ cm and $\sigma=10$ cm. Interpret the z-score of a plant that is 135 cm tall. Provide a concise written explanation.

Cumulative review transfer item: In AP Stats, this item is specifically about Sampling Distributions: sampling distribution, statistic vs parameter, sample proportion, sample mean. A random sample of n = 64 is taken from a population with $\sigma = 12$. Calculate the standard error of the sample mean $\bar{x}$. State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In AP Stats, this item is specifically about Inference for Categorical Data: Proportions: one-proportion z interval, one-proportion z test, two-proportion z interval, chi-square goodness-of-fit. In a chi-square goodness-of-fit test with 5 categories, what are the degrees of freedom? Provide a concise written explanation.