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Details Title: Statistics Vocabulary ch2 Description: concept study Total Flash Cards: 22 Created: 03/06/2006 13:36:53	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term interquartile range (IQR) Definition the distance between the lower and upper quartiles: IQR = Q(U) - Q(L) Term lower quartile Q(L) Definition the 25th percentile of a data set Term middle quartile (M) Definition the median of a data set Term upper quartile (Q(U)) Definition the 75th percentile of a data set Term outlier Definition an observation (or measurement) that is unusually large or small relative to the other values in a data set Term three causes of outliers Definition 1.the measurement is observed, recorded, or entered into the computer incorrectly 2.the measurement comes from a different population 3.the measurement is correct, but represents a rare (chance) event Term sample z-score (for a measurement x) Definition z=(x-xbar)/s Term population z-score (for a measurement x) Definition z=(x-µ)/[population standard deviation, or o] Term 'p'th percentile Definition For any set of 'n' measurements (arranged in ascending or descending order), a number such that p% of the measurements fall below the 'p'th percentile and (100-p)% fall above it Term standard sample deviation Definition 's': the positive suuare root of the sample variance, 's squared', s=the sq. root of 's squared' Term sample variance (for a sample of 'n' measurements) Definition = the sum of the squared distances from the mean divided by (n-1). the symbol 's squared' is used to represent the sample variance Term range (of a quantitative data set) Definition = the largest measurement minus the smallest measurement Term mode Definition the measurement that occurs most frequently in the data set Term skewed data Definition data for which one tail of the distribution has more extreme observations than the other tail Term median (of a quantitative data set) Definition the middle number when the measurements are arranged in ascending (or descending) order Term mean (of a set of quantitative data) Definition the sum of the measurements divided by the number of measurements contained in the data set Term class percentage Definition the class relative frequency multiplied by 100 Term class relative frequency Definition the class frequency divided by the total number of observations in the data set Term class relative frequency Definition the class frequency divided by the total number of observations in the data set Term class relative frequency Definition the class frequency divided by the total number of observations in the data set Term class frequency Definition the number of observations in the data set falling in a particular class Term class Definition one of the categories into which qualitative data can be classified