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...Hypothesis tests for a population mean known section mcgraw hill education objectives perform with the critical value method p describe relationship between and confidence intervals probability of error report or test statistic distinguish statistical significance practical objective performing re are two ways to both methods produce same results in idea is select sample calculate such as compare it null if difference large less likely be due chance true otherwise small may well we must determine how strong disagreement example begin an college board reported recent year that math sat score was standard deviation earlier study suggest coached students should have approximately teacher who runs online coaching program thinks by his higher than this because believes greater alternate hypotheses...