STAB22H3 Lecture : lecture_twentytwo.pdf
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STAB22H3 Full Course Notes
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Lecture twenty two: many times scientists and statisticians are interested in testing claims made about the mean of a distribution, the claim is called the null hypothesis of the test. Typically the claims or hypotheses of the test are written out in the following notation: H0 : = 0 null hypothesis. Ha : (cid:54)= 0 alternative hypothesis: when the alternative to the null hypothesis h0 : = 0 is is bigger or smaller than 0 the test is said to be two sided. 1: the steps involved in testing a null hypothesis are best understood through example, example: the quantity of water in 750 ml bottles is only slightly non-normal. The standard deviation of the quantity of water in 750 ml bottles is 2 ml. I don"t want to get ripped o but i don"t want water that i didn"t pay for either so i perform the test: