You are Here: Home >< Maths

# Past Paper question on AQA S1 Jan 2010 watch

1. Can some one explain the reasoning behind the answer to question 5 part c on this paper?
2. (Original post by SM-)
Can some one explain the reasoning behind the answer to question 5 part c on this paper?
3. (Original post by ghostwalker)
http://filestore.aqa.org.uk/subjects...W-QP-JAN10.PDF
4. Well, what's the whole point of a 98% confidence interval for ? It means it's an interval that has a 98% chance of containing . So what is the chance that it does not contain ?
5. (Original post by Zacken)
Well, what's the whole point of a 98% confidence interval for ? It means it's an interval that has a 98% chance of containing . So what is the chance that it does not contain ?
2% I get it.
So what exactly is a confidence interval?
Is it a range where the mean of a population could be found in and it is made using a samples: size, mean and standard deviation.
6. (Original post by SM-)
2% I get it.
So what exactly is a confidence interval?
Is it a range where the mean of a population could be found in and it is made using a samples: size, mean and standard deviation.
A n% confidence interval is an interval with which the population mean has a n% probability of being in it.
7. (Original post by Zacken)
A n% confidence interval is an interval with which the population mean has a n% probability of being in it.
Ok thanks. Another question, so how do you did whether two events are mutually exclusive or not and whether they are independent or not?
For mutually exclusive do you find the probability of both events occurring and if equals 0 then they are?
For independent events do you find the probability of A given B occurs and A given B' and if equal they are independent?
8. do you have to show working out for s1?
9. (Original post by SM-)
Ok thanks. Another question, so how do you did whether two events are mutually exclusive or not and whether they are independent or not?
For mutually exclusive do you find the probability of both events occurring and if equals 0 then they are?
For independent events do you find the probability of A given B occurs and A given B' and if equal they are independent?
Mutually exclusive means that and independence means that (amongst other things) .

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: June 3, 2016
Today on TSR

### Three reasons you may feel demotivated right now

...and how to stay positive

### Can I get A*s if I start revising now?

Discussions on TSR

• Latest
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

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