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### 32 Cards in this Set

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 Mean of population u Standard Deviation of Population o Variance of Population o Size of Population N Mean of Sample _ X Standard Deviation of the Sample S Variance of Sample S2 Size of Sample n Sum E Confidence interval C.I. Statistic for test of Nominal Data X2 Statistic for test of Ordinal data one sample T Statistic for test of Ordinal data 2 samples U Statistic for test of Interval/Ratio data t Number of categories in a nominal test k Degree of freedom df Sum of Squares SS Standard Deviation of the Difference SD Standard Error Sx or Ox Central Limit Theorem 1) If the sample has 50 or more subjects, then the sampling distribution will be normal. 2) The mean of the sample is approximately equal to the mean of the sampling distribution which is equal to the mean of the population X ~ u X = u. 3) The standard error is equal to the standard deviation of the sample ÷ the square root of n. SX = s/Vn You reject the null hypothesis, but the result was a coincidence Type 1 Error You fail to reject the null hypothesis, but the result was coincidence. Type 2 Error Comparison of the average I Q s of 100 children in the 6th grade compared to the same children’s IQ score in the 7th grade. Dependent T-Test Comparison of the I.Q. scores of Hispanics and African Americans in a Florida high school. Independent T-Test Comparison the socio-economic status of the members of our class with the members of another class. Mann-Whitney U Comparison of average number of sick leave days taken by managers and production workers Independent T-Test Comparison of average GRE scores of state and private college graduates Independent T-Test Comparison of political preferences of African Americans and Hispanics Chi Square test of Independence Comparison of class rankings on day one with the final week. Wilcoxon T Comparison of the percentage of depressed patients a hospital has as compared to what is the norm. One Sample to the Population T-test Comparison of the number of children a clinic has referred to it per week over the last month as compared to the average over the last year. One Sample to the Population T-test Comparison of ranked levels of aggression of male and female basketball players Mann Whitney U