You are Here: Home >< Maths

# hey stats 2 Q watch

1. Hey any help wud be greatly appreciated as I do not have the mark scheme to go on.

Paper OCR june 2001

4. An employee is accused by his employer of bein late for work too often. The employee claims that, on average, he is late on no more than one day in ten. The employer finds that, over a random sample of 20 days, the employee is late on r days. The employer carries out a significance test, at the 5% level, to decide whether on average, the employee is late on more than one day in ten.

i) state suitable null and alternative hypotheses for the test.

my ans: H0 : p=0.1
H1 >0.1

ii) Find the set of values of r for which the null hypothesis would be rejected, and state the conclusion of the test in the case r=4.

???

iii) Given that, in fact, the probability that the employee is late for work on a randomly chosen day is 0.2, find the probability of making a Type II error in the test.

???

[B]5) A company manufactures ropes for use by climbers. The company claims that the ropes have a mean breaking strength of 13000. The standard deviation of the breaking strengths of a sample of 50 ropes are measured, in order to test whether the companys claim is justified.

ii) The sample is found to have a mean breaking strength of 12950 newtons. Carry out a significance test, at the 5% level, to decide whether the company's claim is justified.

???

iii) name the theorem used in carrying out your test, and state why it is needed.

ans : central limit theorem, why.....?!?!?

Please any help would bre greatly appreciated, i hav my exam on wed!and my teachers rubbish!!
2. http://www.thestudentroom.co.uk/t120236.htm

you will find this very useful.
http://www.thestudentroom.co.uk/t120236.html
3. (Original post by confused?)
http://www.thestudentroom.co.uk/t120236.htm

you will find this very useful.
http://www.thestudentroom.co.uk/t120236.html
Hey, thank u. do u have the workings out for q5 part 2??!
4. Hey, thank u. do u have the workings out for q5 part 2??! (for june 2001 OCR paper.)

### Related university courses

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 20, 2005
The home of Results and Clearing

### 1,059

people online now

### 1,567,000

students helped last year
Today on TSR

### University open days

1. Sheffield Hallam University
Tue, 21 Aug '18
2. Bournemouth University
Wed, 22 Aug '18
3. University of Buckingham
Thu, 23 Aug '18
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