By David H. Voelker, Peter Z. Orton, Scott Adams
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CliffsQuickReview Statistics introduces you to the attention-grabbing international of records — a robust software used for locating styles in info and inferring very important connections among occasions within the actual international. many folks locate data complicated and intimidating; notwithstanding, even if you are new to statistical data or have to overview for a huge attempt, this reference will simply aid make clear a few of the parts of statistical reasoning and research. As you're employed your method via this overview, you will be able to take on such strategies as
- Graphical monitors and numerical measures
- Probability and sampling
- Principles of checking out and univariate inferential tests
- Bivariate relationships
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Expressed as a formula, P (A) = number of favorable outcomes total number of possible outcomes For example, the probability of randomly drawing an ace from a wellshuffled deck of cards is equal to the ratio 4/52. Four is the number of favorable outcomes (the number of aces in the deck), and 52 is the number of total outcomes (the number of cards in the deck). 077. 0 (certainty). The classic theory assumes that all outcomes have equal likelihood of occurring. In the example just cited, each card must have an equal chance of being chosen—no card is larger than any other or in any way more likely to be chosen than any other card.
18 b. 2 c. F 4/27/01 9:16 AM Page 23 Chapter 3 NUMERICAL MEASURES Chapter Check-In ❐ Calculating and understanding the central tendencies of data ❐ Using measures of variability to describe the spread in data ❐ Discussing the principle types of measurement scales his section discusses how to graph numerical information—to transform it into a picture—to get a better sense of the data. Another way T to get a sense of data is to use numerical measures, certain numbers that give special insight into your values.
285 40 Properties of the Normal Curve Known characteristics of the normal curve make it possible to estimate the probability of occurrence of any value of a normally distributed variable. Suppose that the total area under the curve is defined to be 1. F 4/27/01 9:18 AM Page 55 Chapter 5: Sampling 55 any value you can name will be somewhere in the distribution. ) Similarly, because half of the area of the curve is below the mean and half is above it, you can say that there’s a 50 percent chance that a randomly chosen value will be above the mean and the same chance that it will be below it.