Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Right, I'm pretty up to date with my stats..
    The only thing which could trip me up is one of those wordy questions

    I've just started a practice paper and the first question I got was

    "explain breifly what you understand by...
    a) a statistic
    b) sampling distribution"

    I can't find the right bit in the book, can anyone help me out here, or point me in the right direction?

    ta luvs.
    Offline

    0
    ReputationRep:
    a statistic is "a random vaiable consisting of any function of the sample data that involves no other quantities"

    a sampling unit is "an individual member of a population"

    according to my teacher! xx
    Offline

    2
    ReputationRep:
    (Original post by kimoni)
    "explain breifly what you understand by...
    a) a statistic
    b) sampling distribution"
    The examiner might like you to include examples.

    (a) A statistic is a function of the observed data. For example, if the observed data is X(1), ..., X(n) then (X(1) + ... + X(n)) / n is a statistic.

    (b) The sampling distribution of a statistic T is the probability distribution of T. For example, let X(1), ..., X(n) be independently normal with mean m and variance 1. Let T be the statistic (X(1) + ... + X(n)) / n. The the sampling distribution of T is normal with mean m and variance 1/n.
    Offline

    14
    ReputationRep:
    does anyone have the ohter definitions for this waffle?
    Offline

    9
    (Original post by kikzen)
    does anyone have the ohter definitions for this waffle?
    Sampling Distribution - When all possible samples of the population have been taken, the probability distribution formed by the samples is known as the sampling distribution.

    *NB - Was from memory so could be inaccurate*
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks guys, appreciate it!
    Offline

    1
    ReputationRep:
    Population - a collection of items

    Sampling Frame - a list of items in a population

    Census - a complete enumeration of a population

    Sample - a selection of items from a poulation

    Statistic - a random variable consisting of any function of the sample data that contains no other quantities

    Null hypotheis - the working hypothesis, which is assumed to be true.

    Alternative hypothesis - the hypothesis that describes the situation if H0 is not true

    Test statistic - a statistic used in a hypothesis test

    Sampling distribution - the distribution of a statistic

    Critical region - the range of values of a test statistic that would lead you to reject Ho

    Significance level - used to determine the critical regio. It is the level of probability we are prepare to accept. It is the probability of rejecting H0 assuming H0 is true.

    They're all the ones i've got
    Offline

    0
    ReputationRep:
    >>Population - a collection of items
    I'd say a set of individuals, about whom the data is collected.
 
 
 
Turn on thread page Beta
Updated: June 21, 2004
Poll
Do you think parents should charge rent?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

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.