Consider a Hypothesis Test to Compare the Difference Between Two

Multiple Choice

Consider a hypothesis test to compare the difference between two population means based on independent samples.If the null hypothesis is rejected,which of the following things could have occurred?

A) A Type I error
B) An increase in the power of the test.
C) A decrease in the power of the test.
D) A Type II error
E) Both a Type I error and a Type II error