The grade point averages (GPA) for 12 randomly selected
college students are shown on the right. Complete parts (a)
through (c) below.
Assume the population is normally distributed.
2.2 3.4 2.7
1.7 0.6 4.0
2.3 1.2 3.5
0.1 2.3 3.4
(a) Find the sample mean.
x=
(b) Find the sample standard deviation.
s= (c) Construct a 90 % confidence interval for the population mean
μ.
A 90 % confidence interval for the population mean is (__,
__)