SOLUTION: 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
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Assume the population
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Question 1120473: 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
3.1
2.6
1.6
0.6
4.0
2.3
1.4
3.8
0.1
2.4
3.1
(a) Find the sample mean.
(Round to two decimal places as needed.)
(b) Find the sample standard deviation.
(Round to two decimal places as needed.)
(c) Construct a 95% confidence interval for the population mean mu.
A 95% confidence interval for the population mean is?
(Round to two decimal places as needed.) Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! sample mean x bar=2.27
sample sd s=1.19
95%CI has half interval t 0.975 df=11 is ts/sqrt(n)
This is 2.20*1.19/sqrt(12)=0.76
Interval is mean +/- half interval or (1.51, 3.03)
