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Math Forum » Discussions » Courses » ap-stat

Topic: [ap-stat] np>10?
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George Lessig

Posts: 54
Registered: 4/14/10
[ap-stat] np>10?
Posted: May 3, 2012 8:22 PM
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On a multiple choice question, the problem asked why one must check the np
and n(1-p) condition for z-tests for proportions. The answer key stated
that the answer was because z-tests should not be used on highly skewed
sampling distributions. Could someone clarify this for me? I feel like I
will have a hard time explaining this to my class.

Thanks in advance,

George Lessig
Calhoun HS

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