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 December 3rd, 2012, 07:03 PM #1 Newbie   Joined: Dec 2012 Posts: 9 Thanks: 0 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
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

$\text{W h y a r e y ou t y p i n g l i ke t h a t ?}$

$\text{A n y w o n d er w h y n o on e i s }\text{r e p ly }\text{i n g ?}$

 December 3rd, 2012, 09:35 PM #3 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs 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?
 December 4th, 2012, 06:28 AM #4 Global Moderator     Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4 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!
 December 4th, 2012, 08:40 AM #5 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,415 Thanks: 1025 Re: multiple choice stats question
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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