Does this difference of 2 points on the political engagement scale indicate a real difference between social media users and the general population? A one-tailed t-test yields a t-statistic that is larger than the decision t at an alpha of .01. Therefore, we reject the null hypothesis, which states that the mean score for the population of social media users is equal to 4.

a. Which kind of error, Type I or Type II, is it possible that we have made in this example? Explain why.

b. What is the probability that we have committed the kind of error that you identified in Part a?