You are Here: Home >< Maths

# Hypothesis Testing Watch

1. 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.
2. 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.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 8, 2010
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Women equal with Men?

Discussions on TSR

• Latest
• ## 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
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## 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

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