If we do four statistical tests in situations where the null hypothesis is true and use an a = 0.05 threshold, there is an 18.5% chance we have made at least one Type I error.

Question

Quizplus · Accepted Answer

When conducting multiple statistical tests, the probability of making at least one Type I error increases with each test. The formula to calculate this probability is 1 - (1 - α)^n, where α is the significance level (0.05 in this case) and n is the number of tests. For four tests, this gives 1 - (1 - 0.05)^4 = 0.185, or an 18.5% chance of making at least one Type I error.

If We Do Four Statistical Tests in Situations Where the Null