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December 3rd, 2012, 07:03 PM   #1
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multiple choice stats question 4

A m e th o d c u r ren tl y us e d b y d o ct o r s t o s cr e e n w ome n f or p o s si b l e b r ea st ca n c e r fa il s t o d e tec t c a n ce r
i n 1 5 % o f t h e w o m e n w h o a c t u a l l y h a v e t h e d i s e a s e . A n e w m e t h o d h a s b e e n d e v e l o p e d t h a t
r e s ea r c he r s h op e wi ll b e a b le t o d e te ct c a n c er mor e a c cu ra t e ly . A r a n d om s am p l e of 6 0 women known
t o h a v e b r e a st ca n c e r we r e s c r e e n e d u si n g t h e n e w m e t h o d . Of th e s e , t he n e w me t ho d f a ile d t o d e te ct
cancer in 7. Calculate the test statistic used by the researchers for this test of hypothesis.

A ) z=.117
B ) z=0.72
C ) z=-0.72
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December 3rd, 2012, 07:48 PM   #2
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Re: multiple choice stats question

Hello, sfrost!

Quote:
A m e th o d c u r ren tl y us e d b y d o ct o r s t o s cr e e n w ome n f or p o s si b l e b r ea st ca n c e r fa il s t o d e tec t c a n ce r
i n 1 5 % o f t h e w o m e n w h o a c t u a l l y h a v e t h e d i s e a s e . A n e w m e t h o d h a s b e e n d e v e l o p e d t h a t
r e s ea r c he r s h op e wi ll b e a b le t o d e te ct c a n c er mor e a c cu ra t e ly . A r a n d om s am p l e of 6 0 women known
t o h a v e b r e a st ca n c e r we r e s c r e e n e d u si n g t h e n e w m e t h o d . Of th e s e , t he n e w me t ho d f a ile d t o d e te ct
cancer in 7. Calculate the test statistic used by the researchers for this test of hypothesis.

A ) z=.117
B ) z=0.72
C ) z=-0.72






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December 3rd, 2012, 09:35 PM   #3
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Re: multiple choice stats question

Umm, yes, please post without the odd spacing, using the same title for multiple topics, overuse of exclamation marks in the topic titles, etc. You don't seriously expect someone to try to decipher this mess do you?
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December 4th, 2012, 06:28 AM   #4
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Re: multiple choice stats question 4

I suspect it's a novice attempt to hide cheating.
Doesn't really bother me THAT much, but it definitely toes the "English only" line!
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December 4th, 2012, 08:40 AM   #5
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Re: multiple choice stats question

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December 4th, 2012, 01:34 PM   #6
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Re: multiple choice stats question 4

Quote:
Originally Posted by sfrost
A method currently used by doctors to screen women for possible breast cancer fails to detect cancer
in 15% of the women who actually have the disease. A new method has been developed that
researchers hope will be able to detect cancer more accurately. A random sample of 60 women known
to have breastcancer were screened using the new method. Of these, the new method failed to detect
cancer in 7. Calculate the test statistic used by the researchers for this test of hypothesis.
Hope he gets caught. uh, for reference material of course
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