At the usual significance level of 5 if a large number of si

At the usual significance level of 5%, if a large number of significance tests are conducted on an equally large number of independent samples then we expect to a Type 1 error to occur (rejecting the null when it should not be rejected) in approximately _____ of the hypothesis tests.

A) 10%
B) 5%
C) Never
D) Impossible to determine

And once you reject the null and conclude the alternative, is it possible to have a Type 2 error?

Solution

The significance level is, by definition, the probability of getting a type 1 error when a test is conducted many times.

As the significance level here is 5%, then the answer is

OPTION B: 5% [ANSWER]

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No, a type II error only happens when we accept the null hypothesis. [not possible]