PSYC 3301 Lecture Notes - Lecture 2: Type I And Type Ii Errors, Null Hypothesis, Statistical Hypothesis Testing
Document Summary
Hypothesis testing: allows a researcher to make inferences about a population from a sample. State an hypothesis about a population of interest: usually this includes the value of a population parameter. The average iq of ksu undergraduates is 109. The average amount of time it takes an adult to fall asleep in 8 minutes. There is no difference between the sample & the population. The iv (treatment) will have no effect on the dependent variable. There is a difference between the sample & the population. The iv (treatment) will have an effect on the dependent variable. Probability value that is used to define the extremely unlikely sample outcome if the null hypothesis is true. A < . 05, there is a 5% chance that the sample outcome may not reflect a true effect (error or chance) Z = sample mean hypothesized population mean. M - (mean of the sample mean of the population)
