It is well known that infants born to mothers who smoke tend to be small and
prone to a range of ailments. It is conjectured that experienced nurses are able
to tell whether the mother is a smoker from the baby's appearance alone. Expe-
rienced nurses were shown selections of photographs of babies, one half of whom
had smokers as mothers; the nurses were asked to judge from a baby's appearance
whether or not the mother smoked. In 1500 trials the correct answer was given
910 times. Is the conjecture plausible? If so, why?
Please could someone help me to do this question, thank you.
Hypothesis Testing Watch
- Thread Starter
- 08-12-2010 21:46
- 08-12-2010 23:52
Define X eg. the number of photos correctly judged
Null hyp: p=0.5 (random choice)
Alt hyp: p>0.5
Then find P(X>910)- will have to use a sensible approximation to the binomial distribution here to calculate this. Also need to choose significance level before carrying this out.