STA 2023 Quiz: Statistical Methods I Test 1 [REVIEW]
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Inference decision, estimate or prediction d: measure of reliability based on probability, qualitative values of x are categories, examples gender, race, quantitative values of x are numerical measurements, types of data. Numerical measure of central tendency sec 2. 4: mean: average, m=population mean b, n sample size (x bar) =sample mean, median a. the very middle age of all ages (middle of data) first arrange data in numerical order then find the middle. i. ii, n is odd: median=middle number, n is even: median average of the 2 middle numbers. 2. 5 measure of variability: range= maximum minimum, data set: 1,3,3,3,10, range= 9 ii. (x bar)= 4, median= 3, data set: 1,1,3,5,10, range=9 ii. (x bar)=4, median=3, variance, s2 = sample variance, 2 = population variance, standard deviation: positive square root of the variance a. b. s= sample standard deviation. S=0this meansthe data doesn" t deviate whichmeansits all the same . The greater the cariation the mean, the largerthe value of s.
