The grade point averages for 10 randomly selected students in an algebra class with 125 students are listedbelow. What is the effect on the width of the confidence interval if the sample size is increased to 20?2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8
A) The width decreases.
B) The width increases.
C) The width remains the same.
D) It is impossible to tell without more information.

Question

Quizplus · Accepted Answer

The width of the confidence interval decreases as the sample size increases because the standard error of the mean decreases with a larger sample size, leading to a more precise estimate.

The Grade Point Averages for 10 Randomly Selected Students in an Algebra