Applying Statistical Inference: An Example Calvin has set his alpha level at .05.He will reject the null hypothesis if he observes a difference between treatment conditions that is so large that it could have occurred by chance
A)5 in 100 times.
B)at least 5 in 100 times.
C)less than 5 in 100 times.
D)more than 5 in 100 times.

Question

Quizplus · Accepted Answer

Setting the alpha level at .05 means that Calvin is willing to accept a 5% chance of incorrectly rejecting the null hypothesis (Type I error). Therefore, he will reject the null hypothesis if he observes a difference between treatment conditions that could have occurred by chance less than 5 in 100 times. This corresponds to choice C.

Applying Statistical Inference: an Example Calvin Has Set His Alpha