Psychology 2135A/B Study Guide - Null Hypothesis, Test Statistic, Standard Deviation

• School: Western University
• Department: Psychology
• Course: Psychology 2135A/B
• Professor: Sandra Hessels

Document Summary

Point estimate a summary statistic from a sample that is just one number used as an estimate of the population parameter. Instead, research should be presented with interval estimates when possible. Interval estimates based on a sample statistic and provides a range of plausible values for the population parameter. Frequently used by media, constructed by adding and subtracting a margin of error from a point estimate. Confidence interval is an interval estimate, based on the sample statistic, that would include the population mean a certain percentage of the time if we sampled from the same population repeatedly. We expect to find the population mean within a certain interval a certain percentage of the time usually 95% Confidence interval is centered around the mean of the sample. Indicates the 95% that falls btwn the two tails. The confidence level is 95%, but the confidence interval is the range btwn the two values that surround the sample mean.