Question

A researcher is investigating the relationship between political views and terrorism. In a recent terror attack, the researcher concludes there is no difference in political views after the attack. In reality, citizens became less progressive after the attack. The researcher has _____________________.

committed a Type II error

correctly rejected the null hypothesis  

  correctly failed to reject the null hypothesis

committed a Type I error

Answer 1

We generally take null hypothesis as indifference and alternative hypothesis as per possible claim.

We have to test for null hypothesis

against the alternative hypothesis

We know,

Here, the researcher concluded in favor of null hypothesis, but in reality it is not true. Thus is accepted when is false.

Hence, the researcher has committed a Type II error.