Sally is asked 10 questions and is told to give her answer in intervals such that $20 \%$ of the time the correct answer fell above the interval and $20 \%$ of the time the answer fell below
The interval. The experimenter concludes that Sally is under-confident. For how many questions did the true answer fall within Sally's given intervals?
A) 3
B) 6
C) 5
D) 7

Question

Quizplus · Accepted Answer

If 20% of the time the answer is above and 20% below, then 60% of the time the answer should fall within the interval. For 10 questions, this means 6 questions should fall within the interval. However, since Sally is considered under-confident, she likely provided wider intervals, resulting in more than 6 questions falling within the intervals. Therefore, 7 questions is a reasonable estimate.

Sally Is Asked 10 Questions and Is Told to Give 20%20 \%20%

Sally Is Asked 10 Questions and Is Told to Give $20 \%$