A test of writing ability is given to a random sample of students before and after they completed a formal writing course.The results are given below.Construct a 99% confidence interval for the mean difference between the before and after scores if
(before-after)= 2.0 and
=2.6457
A)(-0.2,4.2)
B)(-0.1,4.1)
C)(-13.6,17.6)
D)(1.2,2.8)
E)(-0.5,4.5)

Question

A test of writing ability is given to a random sample of students before and after they completed a formal writing course.The results are given below.Construct a 99% confidence interval for the mean difference between the before and after scores if 
(before-after)= 2.0 and 
=2.6457 
A)(-0.2,4.2) 
B)(-0.1,4.1) 
C)(-13.6,17.6) 
D)(1.2,2.8) 
E)(-0.5,4.5)

Quizplus · Accepted Answer

The Answer of A test of writing ability is given to a random sample of students before and after they completed a formal writing course.The results are given below.Construct a 99% confidence interval for the mean difference between the before and after scores if 
(before-after)= 2.0 and 
=2.6457 
A)(-0.2,4.2) 
B)(-0.1,4.1) 
C)(-13.6,17.6) 
D)(1.2,2.8) 
E)(-0.5,4.5)

A Test of Writing Ability Is Given to a Random