Researchers Assessed the Effectiveness of Courses on Logic and Computer

Multiple Choice

Researchers assessed the effectiveness of courses on logic and computer thinking for adult residents of the city. 10 adults were tested on the topic of logic and computer thinking before and after the courses, their knowledge was evaluated on a scale of 0 to 20. The resulting data are given in the accompanying table. Assume that the sample of 10 adults is representative of adult residents of the city. ​ Construct and interpret a 90% confidence interval estimate for the difference in the mean score before and after courses on logic and computer thinking.

A) The confidence interval is
.
You can be 90% confident that the actual difference in the mean score before and after courses on logic and computer thinking for adult residents of the city is between -3.784 and -0.216.
B) The confidence interval is
.
You can be 90% confident that the actual difference in the mean score before and after courses on logic and computer thinking for adult residents of the city is between -3.446 and -0.554.
C) The confidence interval is
.
You can be 90% confident that the actual difference in the mean score before and after courses on logic and computer thinking for adult residents of the city is between -4.564 and 0.564.
D) The confidence interval is
.
You can be 90% confident that the actual difference in the mean score before and after courses on logic and computer thinking for adult residents of the city is between -6.573 and 2.573.
E) The confidence interval is
.
You can be 90% confident that the actual difference in the mean score before and after courses on logic and computer thinking for adult residents of the city is between -1.446 and 1.446.