Multiple Choice Strategy:Some students have suggested that if you have to guess on a multiple-choice question, you shouldalways choose C. Carl, the student, wants to investigate this theory. He is able to get a sample of past tests and quizzes from various teachers. In this sample there are90multiple-choice questions with four options (A, B, C, D). The distribution of correct answers from this sample is given in the frequency table below.

CorrectAnswerFrequencyA16B20C36D18

(a) If the correct answers for all multiple-choice problems are uniformly distributed across the four options (A, B, C, D), what is the theoretical proportion of those which should have the answerC?Express your answer as an exact decimal, not a percentage.

(b) Based on the sample that Carl collected, what is the point estimate for the proportion of all multiple-choice questions with a correct answer ofC?Round your answer to 3 decimal places.

(c) What is the critical value ofz(denotedz_/2) for a99%confidence interval?Use the value from the table or, if using software, round to 2 decimal places.

z_/2=

(d) What is the margin of error (E) for a99%confidence interval?Round your answer to 3 decimal places.

E=

(e) Construct the99%confidence interval for the proportion ofallmultiple-choice questions with a correct answer ofC?Round your answers to 3 decimal places.

<p<

(f) Can Carl be99%confident that the correct answer ofCshows up more frequently than the theoretical value found in part (a) would suggest?

No, because 0.25 is within the confidence interval limits.

Yes, because 0.25 is below the lower limit of the confidence interval.

No, because 0.25 is below the lower limit of the confidence interval.

Yes, because 0.25 is within the confidence interval limits.