Applying Statistical Inference: An Example If an experimenter finds that the difference between two treatment groups is significant at the .05 level, then
A)the odds of obtaining this difference by chance are 95 in 100 times.
B)the probability of this treatment effect is 5%.
C)we would expect chance to produce a result this large less than 5 in 100 times.
D)we should accept the null hypothesis.

Question

Quizplus · Accepted Answer

The .05 level of significance means that there is a 5% chance that the observed difference between the treatment groups occurred by chance. Therefore, we would expect chance to produce a result this large less than 5 in 100 times. This means that it is unlikely that the observed difference is due to chance and suggests that the treatment effect is real. We should reject the null hypothesis.

Applying Statistical Inference: an Example If an Experimenter Finds That