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stats week 2

QuestionAnswer
shape numbers of peaks, symmetry
density curve curve showing the distribution of data, its overall pattern
center mean, mode, median
spread range, standard deviation, quartiles (IQR), outliers
probability total area under distribution curve, is 1
68 96 99.7 rule 68% of values are in 1 standard devs of the mean, 95% are in 2 standard devs of the mean, and 99.7% are in 3 standard devs of the mean
standardized value (z score) standardizing data, converting values into a standardized form. used to calculate probabilities
backwards normal problems given probability to find zscore
sampling distribution mean of a mean. mean of several sample sizes. always averages to normal even if something is originally skewed
way to reduce bias use random sampling.
reduce variability use larger sample
central limit theorem measuring multiple sample sizes will closely reflect the average and samples of more variables (i.e. sample of 100 vs sample of 5) will be closest to the average and the standard dev will shrink.
Created by: user-1742075
 

 



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