Dr. V - Ch 1-8, plus proportions

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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online