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The grade point averages (GPA) for 12 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. Assume the...

The grade point averages​ (GPA) for 12


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

Assume the population is normally distributed.

2.2


2.2

3.3


3.3

2.8


2.8

 

1.8


1.8

0.9


0.9

4.0


4.0

2.2


2.2

1.5


1.5

3.6


3.6

0.3


0.3

2.4


2.4

3.4


3.4

​(a) Find the sample mean.

x overbar


xequals


=

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 95


95​% confidence interval for the population mean mu


μ.

A 95


95​% confidence interval for the population mean is left parenthesis nothing comma nothing right parenthesis .

7.PNG



,


.

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

7.PNG

Top Answer

Part-a Xbar=2.37 Part-b S=1.12 Part-c Critical t = TINV(0.05,12-1) =2.201 95%... View the full answer

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