----- Original Message -----
From: John Lexmark <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, May 30, 2000 6:50 PM
Subject: I need Help!!
> Please help me to solve this problem, I am stuck...
>
> An inspector inspects large truckloads of potatoes to determine the
> proportion p in the shipment with major defects prior to using the
potatoes
> to make potato chips. Unless there is clear evidence that this
proportion
> is less than 0.10 she will reject the shipment. To reach a decision
she
> will test the hypotheses
>
> H0: p=0.10, Ha: p<0.10
>
> Using the large sample test for a population proportion. To do so,
she
> selects an SRS of 50 potatoes from the more than 2000 potatoes on
the truck.
> Suppose that only 2 of potatoes sampled are found to have major
defects.
> Determine the P-value of her test.
If you go to your instructor with this problem [s]he will know
that at least one student in the class has been having trouble with
this rather standard problem.
If this is a take-home test, or for other reasons you have been
told that you must do it on your own, act accordingly.
By the way, the phrasing of this question is surely a case of
"hypercorrectness"! An inspector making shipment acceptance decisipons
does _not_ compute p-values, but tests at a fixed alpha (NOT
necessarily 5%, but decided ahead of time and made part of the
standard procedure.) There are few situations where fixed alpha
testing is approprtiate - this is one of them.
-Robert Dawson
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