PSYC 218 Lecture Notes - Lecture 14: Confidence Interval, Standard Deviation
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General equation: d = |mean difference| / population standard deviation. Conceptual equation: d = |meanobt - | / . When we use single sample t test, we estimate *************** If you have a directional alternative hypothesis for your study, then meanobt should be in direction predicted by h1 in order to calculate ^d. If meanobt is in opposite direction, we would conclude by retaining h0, and it would not make sense to inquire abt the size of effect. ^d = |meanobt - | / s = |7. 70 = 6. 00| / 1. 25 = 1. 36. Sometimes, we are interested in knowing what the value of some parameter is. We want to know the value of , but we don"t know the population value. All we have to go on is some statistic. (we only have meanobt as an estimate of ) Take random sample of 20 nhl players. Point estimate: compute mean of sample meanobt = 185.
