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

    2
    ReputationRep:
    Right..so I'm a bit confused about hypothesis testing. In some examples, a probability is worked out using the cumaltive binomial distribution tables or through the binomial distrubution, and then minused from one, and THEN compared to the significance level. In other examples, the probability from the binomial distribution is NOT minused from one, and directly compared to the significance level.

    Im about to start applying this to critical regions which will no doubt, confuse me even more.

    I'd be grateful if anyone could try and help me.

    Thank you.
    • Community Assistant
    Offline

    18
    ReputationRep:
    Community Assistant
    If  P(X\leq x)\leq \alpha then you can read straight off of the cumulative probability table. However if it's P(X\geq x)\leq \alpha, then to use the probability table you have to change it, so
     P(X\geq x) = 1 -P(X\leq x-1)
    So  1 - P(x\leq x-1)\leq \alpha now you can rearrange and use tables.

    To see why it is 1-P(x\geq x-1) use an example with numbers;


     P(x\geq 15) = 1-P(x\leq 15-1) = P(x\leq 14)
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Help with your A-levels

All the essentials

The adventure begins mug

Student life: what to expect

What it's really like going to uni

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Uni match

Uni match

Our tool will help you find the perfect course for you

Study planner

Create a study plan

Get your head around what you need to do and when with the study planner tool.

Study planner

Resources by subject

Everything from mind maps to class notes.

Hands typing

Degrees without fees

Discover more about degree-level apprenticeships.

A student doing homework

Study tips from A* students

Students who got top grades in their A-levels share their secrets

Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

Sponsored content:

HEAR

HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

Groups associated with this forum:

View associated groups

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

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