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Chapter 6: Probability, Binomial Distribution - scale that shows the…
Chapter 6: Probability
Inferential procedure to find the relationships between samples and populations. Reminder: Goal of inferential statistics is to begin with the sample and then answer a general question about the population.
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Situation in which several different outcomes are possible: Probability of A = # of outcomes classified as A/total number of possible outcomes.
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Percentile Rank: the percentage of the individuals in the distribution who have scores that are less than or equal to the specific score.
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Random Sample - requires that each individual in the population has an EQUAL chance of being selected. A sample obtained by this process is a SIMPLE RANDOM SAMPLE.
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Normal Distribution
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Symmetrical, highest frequency in the middle and frequencies tapering off as you move toward either extreme. Remember: when any distribution is transformed into z-scores, the mean becomes 0 and the standard deviation becomes 1.
Unit Normal Table - chart listing proportions corresponding to each z-score location in a NORMAL distribution
4 Column format: 1. z-score 2. proportion in body 3. proportion in tail. 4. proportion between mean and Z.
The Body always corresponds to the larger part of the distribution whether it is on the right or left hand side. The tail is always the smaller section regardless of side.
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