LINB29H3 Lecture Notes - Lecture 4: Null Hypothesis, Lexical Decision Task, F-Test
5 Feb 2017
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Take averages from 2 groups for a study. Note the reliability of the variance observed in each. Shape of distribution changes as a function of the number of degrees of freedom. Probability of observing specific f-values is dependent on degrees of freedom. F = var1/var2: = 1 they are the same, =/= 1 they are(cid:374)"t the sa(cid:373)e. Speaker = independent variable, syntimes = dependent variable. Skewed positively, testing if variance between learner group and native group are equal. Tilde (~): dependent variable calculated as a function of independent variable. When testing normality, we subset data to only look at learners and only native. W=1 is normal distribution, therefore this data set is not normally distributed; we accept the null hypothesis. The w-value shows that the distribution is not different from the normal distribution. Null hyp: variances are not different: conclusion: variances are not different.
