The grade point averages for 10 randomly selected students in an algebra class with 125 students are listed below. 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
◦ The width remains the same.
◦ The width decreases.
◦ It is impossible to tell without more information.
◦ The width increases.