University of the PeopleMATH 12811281 - Graded Quiz Unit 3

Document Content and Description Below

A case study that deals with the effect of prior reputation on the evaluation of an instructor is presented in Question 11.1 in the book (Section 11.5). Students were exposed to either one of two co... nditions, C and P, and were asked to rate a lecture given by the instructor. It was found that the average rating among the 25 students that were exposed to condition C was 2.613 and the average rating among the 24 students that were exposed to condition P was 2.236. The sample standard deviations were 0.533 and 0.543, respectively. Question 1 Correct Mark 1.00 out of 1.00 Flag question Question text You want to construct a confidence interval for the expected rating of students that were exposed to condition P. The confidence level of the interval should be 80%. The quantile of the t-distribution that should be used for the construction is: (Assume a Normal distribution for the rating) Select one: a. qt(0.85,23) b. qt(0.925,24) c. qt(0.90,23) d. qt(0.925,23) Feedback The correct answer is: qt(0.90,23) Question 2 Correct Mark 1.00 out of 1.00 Flag question Question text The confidence interval with confidence level of 80% for the expected rating of students that were exposed to condition P is: (Assume a Normal distribution for the rating. Choose the interval closest to the answer) Select one: a. [2.09, 2.38] b. [2.47, 2.76] c. [2.14, 2.33] d. [2.52, 2.71 [Show More]

Last updated: 1 year ago

Preview 1 out of 9 pages