PSYCH 100A Lecture Notes - Lecture 5: Standard Error, Sampling Distribution, Sioux
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I am a researcher interested in how much this year"s seniors remember from 100a. All will take a short 20 question statistics quiz before they register for their classes. Standard error= 3/square root of 16 = . 75. Z-score for alpha= . 05 is + or - 1. 96. The sampling distribution is the population of group means when taking groups of size n. I propose that red shirts help you remember statistics. I take 16 students and assign them to wear red shirts. Compare it to another independent group or control group. The population sampling distribution in the null hypothesis (h0) Hypothesis testing: understand what pure randomness would give us, observe a sample mean (xbar) If so, this mean is not from the null distribution. If not very unlikely, we fail to reject the null and determine that our manipulation had no effect: how unlikely is very unlikely? , = . 05 or . 01 a. i.
