JS 015 Lecture Notes - Lecture 10: Null Hypothesis, Technology In Revelation Space, Test Statistic
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Js 15 lecture 10 z tests: each inferential statistical analysis has significance test, but because they have different uses, each significance test is different, overall involve a decision that involves looking at distribution like the following. Steps for a significance test: z test a. i. H0: actual sample mean = guessed population mean. Decide a-level (a = 0. 05) and nature of test (two-tailed vs. one-tailed) a. iii. Set critical z (z = +/- 1. 96 for alpha level of 0. 05) a. iv. Compare z test statistic with critical z (beyond +/- 1. 96 z?) a. vii. Make decision about null hypothesis (reject or fail to reject) Making a guess about a population mean: example 1: If i was told by a textbook salesperson that the average (mean) textbook cost for students was , i could use that as an estimate. a. i. Next step would be to take sample of students and record their actual sample mean a. iii.
