By setting alpha equal to .05, a "statistically rare" event is defined as an event occurring only 5 or fewer times in occasions if the hypothesis is true.
A)1000; null
B)100; null
C)100; alternative
D)1000; alternative

Question

Quizplus · Accepted Answer

The null hypothesis is not specified in the question, so we cannot determine whether the correct choice is A or B. However, the question states that statistically rare events are defined as occurring only 5 or fewer times, which suggests that the alternative hypothesis is that the event occurs more than 5 times. Therefore, the best choice is B, where the sample size is 100 and the hypothesis being tested is the null hypothesis (which presumably states that the event occurs 5 or fewer times). If the event occurs more than 5 times in the sample of 100, then it would be considered statistically significant at the alpha level of .05.

By Setting Alpha Equal to