(a) Find the sample mean.   ​(b) Find the sample standard deviation.   ​(c) Construct a 90​% confidence interval for the population mean μ.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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The state test scores for
12
randomly selected high school seniors are shown on the right. Complete parts​ (a) through​ (c) below.
 
Assume the population is normally distributed.
1423
1222
980
 
696
721
833
 
728
742
543
 
625
1442
940
 
 
 
 
​(a) Find the sample mean.
 
​(b) Find the sample standard deviation.
 
​(c) Construct a 90​% confidence interval for the population mean μ.
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