ts, find a 90% confidence interval for the population standard
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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i have the answer, can somebody please explain how she got 17.708 for X2L?? my chi. table does not show this number and when i subtract 1-42.557 i get a negative number.
i also do no use excel. please explain.
thanks.
Transcribed Image Text:2. Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard
deviation of 12.23 points, find a 90% confidence interval for the population standard
deviation.
ト=30 S=12.23
0.95
0.05
aos
22=17.708
xR=42.557
(w-1) (R.2) col
42.557
(30-1)02.2372
17.708
10.10C oe 15.65
we
goy. confident That Me populution Shandarld
devistion E(l Stadent IQ Scor es is betwoln
are
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