PSYC 218 Lecture Notes - Lecture 15: Sampling Distribution, Standard Deviation
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Recall z test - t test very close cousin of z test. Used when and of h0 population are known. Zobt = meanobt - / mean, where mean = / square root of n (mean = Used when of h0 population is known, but is unknown. Tobt = meanobt - / smean, where smean = s / square root of n (mean = New movie shown to test audience (random) who rate it from 1 (= bad) to. Over the years, test audiences" ratings have: = 6. 00, but = unknown. New movie"s rating by 10 members of test audience: The new movie is different from an average movie. Sample w/ xobt = 7. 70 is a random sample from population, where =/= 6. 00. The new movie is not different from an avg movie. Sample with meanobt = 7. 70 is a random sample from population where = 6. 00. = 7. 70 - 6. 00 / 0. 3953, where smean = 1. 25 / = 0. 3953.
