second image is the continuation Thanks A local college requ

second image is the continuation. Thanks.

A local college requires an English composition course for all freshmen. This year they are evaluating a new online version of the course. A random sample of n = 16 freshmen is selected, and the students are placed in the online course.

Solution

Z-critical   = +/- 1.96

Z = 80 -76/ 12 = 0.33
days
Failure to rejct null hypothesis , the course has a significant effect

a smaller deviation produces a samller standard error which reduces the likelihood of rejcting null hypothesis