Turn on thread page Beta
    • Thread Starter
    Offline

    9
    ReputationRep:
    I really don't understand when you use rounded values or not in calculations in statistics.

    I thought it was that you don't round anything but the final answer but I did a question just now where in the normal distribution, the standardised score: z value, was 1.497. So I found the probability with that but in the mark scheme, they rounded to 1.50 then continued.

    Because if that my answer was one number off!! And I double checked m calculations. It was all right.

    So are the rules when to round or something!! Please help!
    • Very Important Poster
    Offline

    21
    ReputationRep:
    Very Important Poster
    (Original post by pibobelebeep)
    I really don't understand when you use rounded values or not in calculations in statistics.

    I thought it was that you don't round anything but the final answer but I did a question just now where in the normal distribution, the standardised score: z value, was 1.497. So I found the probability with that but in the mark scheme, they rounded to 1.50 then continued.

    Because if that my answer was one number off!! And I double checked m calculations. It was all right.

    So are the rules when to round or something!! Please help!
    In the case where the table provided (not sure if these are provided in the new spec), the z values come in 2 d.p. so you always rounded to 2 d.p.

    Not sure if this advice holds in the new spec.

    Exceptions weren't values of z like 0.005 etc which are in a second, smaller table.
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by Kevin De Bruyne)
    In the case where the table provided (not sure if these are provided in the new spec), the z values come in 2 d.p. so you always rounded to 2 d.p.

    Not sure if this advice holds in the new spec.

    Exceptions weren't values of z like 0.005 etc which are in a second, smaller table.
    Thanks a bunch!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: February 28, 2018
Poll
Is the Big Bang theory correct?
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.