SOLUTION: The heights of a random sample of 6 fifth - graders have a sample mean of 54.68 inches and a standard deviation of 4.42 inches. Compute a 90% confidence interval for all the fifth

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Question 1082840: The heights of a random sample of 6 fifth - graders have a sample mean of 54.68 inches and a standard deviation of 4.42 inches. Compute a 90% confidence interval for all the fifth graders from this data.
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
On your TI-84,

press STAT
press right arrow twice to highlight TESTS
scroll down to 8:TInterval...
press ENTER

         TInterval    
     Inpt:Data Stats    <--Highlight Stats
     x:54.68
     Sx:4.42
     n:6
     C-Level:0.90
     Calculate          <--Highlight Calculate

It takes a few seconds to calculate. You'll see:

        TInterval
    (51.044,58.316)
    x=54.68
    Sx=4.42
    n=6

The answer is (51.044,58.316) or 51.044 < x < 58.316

Edwin
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