S2 definitions 0.0 / 5 ? MathematicsS2All LevelsEdexcel Created by: Sophie :)Created on: 22-06-14 10:00 Population collection of ALL individual items 1 of 18 Sample selection of individual items from a population 2 of 18 Finite population Each member can be given a number 3 of 18 Infinite population Impossible to assign a number to every member of the population 4 of 18 Sampling unit individual member of the population 5 of 18 Sampling frame List of ALL sampling units 6 of 18 Statistic A quantity calculated solely from the observations in a sample. There are no unknown parameters. 7 of 18 Sampling distribution The probability distribution of all possible values of a test statistic, from all possible samples 8 of 18 Hypothesis A statement about a population parameter 9 of 18 Null hypothesis statement we assume is true unless proven not true 10 of 18 Alternative hypothesis A statement that tells us about the value of the statistic if Ho is proven wrong 11 of 18 Critical region The range of values of the statisic that lead to rejecting Ho 12 of 18 Critical values The values on the boundaries of the critical region 13 of 18 Hypothesis test A mathematical procedure to examine the value of a population parameter, proposed by the Ho compared to H1 14 of 18 One tail test Looks for an increase OR decrease in the parameter. Only critical value. 15 of 18 Two tail test Looks for an increase AND decrease in the parameter. Two critical values. 16 of 18 Actual level of significance Probability of incorrectly rejecting Ho 17 of 18 Actual level of significance Probability of incorrectly rejecting Ho 18 of 18
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