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### 20 Cards in this Set

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• Back
 Independent Variable Something that causes change Dependent Variable Something that changes because of the Independent Variable Population The complete collection of all elements being studied Sample Subcollection of members selected from a population Parameter Numerical measurements describing some characteristics of the population Statistic Numerical measurement describing some characteristic of the sample Nominal Level of Measurement Data that consist of names, label, categories only. Ex: Yes, no, undecided..... colors Interval Level of Measurement Names, labels, but difference between two categories is meaningful. No natural starting point Ex: Temperature, Years Ratio Level of Measurement Meaningful difference, natural zero starting point Ex: weights, prices Ordinal Level of Measurement Can be arranged in some order, but differences are meaningless (cannot be subtracted from each other0 EX: Grades, ranks Lower class limits Smallest numbers that can belong to each class (sample results) Upper class limits Largest numbers that can belong to each class (sample results) Class Boundaries Size of the gap between Upper Limit of one class and Lower Limit of the next. Add 1/2 that to each Upper Limit to find Upper Class Boundaries. Subtract 1/2 that to find Lower Class Boundaries. Class Midpoints Add Lower class limits to Upper class limits and divide by 2. Class width Difference between 2 consecutive Lower class limits or Upper class limits. Median Data values arranged in order, then find middle. If even number of values, median is the mean of both middle numbers Mode Most often repeated Midrange Add highest to lowest and divide by 2. Range Distance between highest and lowest number Standard Deviation Measure of variation of values about the mean