Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    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.
    Offline

    5
    ReputationRep:
    Define X eg. the number of photos correctly judged
    Then X~Bin(1500,p)
    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.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.