PSY521_Week6 - Week 6 Exercises 1 Alpha is the probability...

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Week 6 Exercises 1. Alpha is the probability of making a type I error, which is rejecting the null hypothesis when the null hypothesis is actually true. Beta is the probability of making a type II error, which is failing to reject the null hypothesis when the null hypothesis is, in fact, false. 2. A Null hypothesis true Research hypothesis true Research hypothesis Supported (reject null) Type I Error Deciding that more recess time improves behavior, but it really doesn’t. Correct Decision Deciding that more recess time improves behavior, and it actually does. Study inconclusive (do not reject null) Correct Decision Deciding that the effect of recess time on behavior is not shown on this study; actually more recess time doesn’t improve behavior. Type II error Deciding that the effect of recess time on behavior is not shown in this study; actually more recess time improves behavior. B. Null hypothesis true Research hypothesis true Research hypothesis Supported (reject null) Type I error
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