1. MSV 12: Significance Levels
MSV 12: Significance Levels

2. It is tossed n times, and it comes down tails X times.
It is suspected that a coin is less likely to give a tail than a head when tossed.
It is tossed n times, and it comes down tails
X times.
A hypothesis test is carried out
at a significance level of L%, with
H0: p = ½, H1: p < ½,
where p is the population probability
of getting a tail.

3. The table below shows how the significance
of our result for X varies according to the size of L.

4. (You will find the spreadsheet
Find out what p must be if
n = 29
n = 66
n = 92.
(You will find the spreadsheet
below helpful!)
Significance Levels
Spreadsheet
Hyperlink

5. That makes the table valid.
Varying n,
We can try to find a p
That makes the table valid.
Assuming the table is valid,
plot a graph of p against n...

6. What happens as n gets smaller? Larger?
Could we use the Normal approximation
to the Binomial here?

7. is written by Jonny Griffiths
is written by Jonny Griffiths