Mathematics, 01.10.2019 22:30 nickocasamplonp6mlob
Acertain test preparation course is designed to students improve their scores on the lsat exam. a mock exam is given at the beginning and end of the course to determine the effectiveness of the course. the following measurements are the net change in 6 students' scores on the exam after completing the course: 8,6,12,15,42,23 using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. assume the population is approximately normal. step 4 of 4 : construct the 80% confidence interval. round your answer to one decimal place.
Answers: 2
and s = 13.3367. The confidence interval is given by
where 
is the 
th quantile of the t distribution with n-1=5 degrees of freedom. As we want the 80% confidence interval, we have that 
and the confidence interval is 
where 
is the 10th quantile of the t distribution with 5 df, i.e., 
. Then, we have 
and the 80% confidence interval is given by (9.6, 25.7)Another question on Mathematics
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