So, a “typical” numerical summary is calculated from a sample. However, measuring every unit in the population is usually prohibitive (so the parameter is very rarely calculated). The number (or set of numbers) may be a quantity you are already familiar with (like the average) or it may be something you learn through this text (like the slope and intercept from a least squares model, provided in Section 7.2).Ī numerical summary can be calculated on either the sample of observation or the entire population. In most statistical analysis procedures, the research question at hand boils down to understanding a numerical summary. Ideally, a sample is a small fraction of the population.įor instance, 60 swordfish (or some other number) in the population might be selected, and this sample data may be used to provide an estimate of the population average and to answer the research question. Oftentimes, it is not feasible to collect data for every case in a population.Ĭollecting data for an entire population is called a census.Ī census is difficult because it is too expensive to collect data for the entire population, but it might also be because it is difficult or impossible to identify the entire population of interest! In the first question, the target population is all swordfish in the Atlantic Ocean, and each fish represents a case. Does a new drug reduce the number of deaths in patients with severe heart disease?Įach research question refers to a target population.Over the last five years, what is the average time to complete a degree for Duke undergrads?.What is the average mercury content in swordfish in the Atlantic Ocean?.25 Inference for linear regression with multiple predictorsĬonsider the following three research questions:.24 Inference for linear regression with a single predictor.21 Inference for comparing paired means.
20 Inference for comparing two independent means.17 Inference for comparing two proportions.12 Confidence intervals with bootstrapping.11 Hypothesis testing with randomization.8 Linear regression with multiple predictors.7 Linear regression with a single predictor."I rule!" Classic figure killed off in a 2019 Super Bowl ad campaign Responses "Sick, dude!" Like toreadors, again and again Feel off "That's true about me, right?" Drink served in a snifter Worrisome uncertainties Devices rendered obsolescent by smartphones, in brief Become fixed Where some things are really hopping?: Abbr. Long fur scarfs Outcome of a coin flip, e.g. Expand Purge (of) Atlanta-based health org. Satan, with "the" Crack, as a secret message Shorthand writers, for short Dated Cpl. Maisel" Palindromic woman's name Automotive safety feature represented (and to be followed) eight times in this puzzle Town, in Scandinavia Big Apple? Immunologist Anthony Suffix with coward "Huh-uh" First capital of Alaska Soccer star on a 1999 Wheaties box Bloblike Ill-advised opinions Fury Feeling on a lo-o-ong car trip Lab workers Performer with the hit 2006 album "Hip Hop Is Dead" Voting no _ Beach, Calif. without a federal holiday Father on "The Marvelous Mrs. with a plant Choose randomly, in a way Specialty Like legs in the days after a marathon "Get 'em!" Human, ape or kangaroo Many celebrity golf events Like taxis and Julius Caesar, once Break down chemically Mo. Doesn't stay natural? Fell off, as laughter Place Investments of a sort, for short "Well, which is it?!" Co. More answers for JanuBeloved, in Arabic Masthead listings, for short Italian herbal liqueur "Please, please, please?" People calling the shots at the zoo? Not radical Drink with a dome-shaped lid Where to find the Egyptian Temple of Dendur, with "the" Crush, as a test Cry from a survivor Clara in the National Women's Hall of Fame Stuffed oneself with, facetiously Newswoman Roberts Recipe amt.
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