Dr. V - Ch 1-8, plus proportions

# Dr. V - Ch 1-8, plus proportions - Dr V Study Guide Ch 1-8...

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Dr. V – Study Guide – Ch 1-8, plus “About proportions” Descriptive Statistics 1. Given a N (3.1 ft, 1.2), what is the name (and units) for 1.2? How would you interpret it? The population’s standard deviation is 1.2 ft (same units). That measure of variability is roughly the average distance of the data (or scores) from the 3.1 mean. 2. A median is preferred (over a mean) when data is . . . . . 3. How do you determine whether an observation is an outlier? . . . Using a box plot, be able to determine the “boundaries” with the 1.5xIRQ rule outliers. 4. What adjectives could apply to histograms? What adjectives could apply to time plots? Why are they different? Vocabulary Words – Understand the basic meaning of the following: bar charts, histograms, population, sample, parameter, statistic, estimate, observational study, experiment, explanatory variable, response (or outcome), confounding variable, probability, conditional probability, complement, mutually exclusive (or disjoint), independent, random variable, inference, bias (response, non-response, selection). Snoring vs Life of the Party (See p 244): P(likes-to-party) = ?, P(snore and likes-to-party) = ?, P (snores or likes-to-party) = ?, P(likes-to-party | snores) = ?. Are “snoring” and “likes-to-party” independent? Are snoring and likes-to-party disjoint? Ch 8 – Random Variables About discrete distributions 1. Suppose x = # phone calls over lunch to a particular office (X = 0, 1, 2, 3, 4) so that x 0 1 2 3 4 P(x) 0.2 0.35 0.25 0.12 ? a. What’s the P(X=4)? . . . complement rule gives you P(X=4) b. What’s the expected number of phone calls? . . . When you see “expected” or E(X), think MEAN (and means get decimals). Here, it’s E(X) = Σ xp(x) = 0x0.2 + 1x0.35 + 2x0.25 + etc. c.

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Dr. V - Ch 1-8, plus proportions - Dr V Study Guide Ch 1-8...

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