Use the Following to Answer the Questions Below

Multiple Choice

Use the following to answer the questions below:
A professor with a large introductory statistics class noticed that nearly half of his students missed class the day before a long break (like Thanksgiving Break or Spring Break) . He randomly called on students and found 10 students in attendance and 10 students who had skipped class. Later in his office, he examined the current course grades for the 20 students he had selected. A plot of his findings and summary statistics are provided. Note that the grades were entered as proportions, and thus a grade of 0.925 is a 92.5% in the course.

-Construct a 98% confidence interval for the difference between the mean grades for students attending and not attending class the day before break. Use four decimal places in your margin of error.

A) -0.0132 to 0.1848
B) 0.0278 to 0.1438
C) -0.0042 to 0.1758
D) -0.0095 to 0.1811