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probability of correctly rejecting a null hypothesis that is false- measured on scale of 0-1
factors that effect statistical power
-sample size (larger sample larger the power)
-size of the treatment effect
-Alpha level
-one or two tailed test
-significance level
-type of hypothesis test
hypothesis testing using a z-score
1) State the null (H0 ) and alternative (Ha ) hypotheses.
2) Determine the critical values.
3) Calculate the z-score.
4) Compare the z-score to the critical value and determine whether to reject H0.