PSYCH 2220H Lecture Notes - Lecture 9: Standard Error, Null Hypothesis, Confidence Interval

• School: Ohio State University
• Department: Psychology
• Course: PSYCH 2220H
• Professor: Cravens- Brown Lisa Marie

Document Summary

Confidence intervals: use m not for mean, steps. B. 4. b: 95% ci is [mlower, mupper, if m is contained within ci then h0 will not be rejected. If we repeatedly sample the population, 95% of the time a confidence interval calculated using this method would capture the true midwest population murder rate. A: cohen"s d is how many standard deviations the two populations are, midwest murder rate was standard deviation below the usa rate (moderate effect size) 18-29 year olds in usa population; psych 2220h. B/c know =9 but don"t know and comparing one sample to population: step 2. There is no difference between psych 2220h class books read in a year and the population of 18-29 year olds. Reject if t> 2. 069 or t 0. 05. Psych 2220h students do not differ in average number of books read/year from the usa population of 18-29 year olds.