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The grade point averages​ (GPA) for 1212 randomly selected college students are shown on the right....

The grade point averages​ (GPA) for

1212

randomly selected college students are shown on the right. Complete parts​ (a) through​ (c) below.

Assume the population is normally distributed.

2.52.5

3.33.3

2.92.9

1.91.9

0.80.8

4.04.0

2.42.4

1.41.4

3.73.7

0.40.4

2.12.1

3.43.4

​(a) Find the sample mean.

x overbarxequals=nothing

​(Round to two decimal places as​ needed.)

​(b) Find the sample standard deviation.

sequals=nothing

​(Round to two decimal places as​ needed.)​(c) Construct a

9999​%

confidence interval for the population mean

muμ.

A

9999​%

confidence interval for the population mean is left parenthesis nothing comma nothing right parenthesis .,.

​(Round to two decimal places as​ needed.)

math   Statistics-And-Probability   
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Answer #1

The statistic software output for this problem is:

Summary statistics: Column Mean Std. dev. data 2.4 1.1369817

One sample T confidence interval: H: Mean of variable 99% confidence interval results: Variable Sample Mean Std. Err. DF L. L

(a) sample mean = 2.4

(b)  the sample standard deviation = 1.14

(c)

CI is : (1.38 , 3.42)

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