# How does repeating results obtain more accurate results?

Watch
Announcements
#1
This is a 3 mark question in an exam tomorrow, and I'm not too sure what to write.
It's GCSE ISA.
It's supposed to say accurate & not reliable...

Would this gain 3 marks ?

By using repeated results, I could detect any anomalous results and find out an average of the repeated results to obtain a more accurate result because any random errors would be excluded out.

0
8 years ago
#2
(Original post by aneducation)
This is a 3 mark question in an exam tomorrow, and I'm not too sure what to write.
It's GCSE ISA.
It's supposed to say accurate & not reliable...

Would this gain 3 marks ?

By using repeated results, I could detect any anomalous results and find out an average of the repeated results to obtain a more accurate result because any random errors would be excluded out.

It means you can get a wider range of results, allowing you to get a mean(average) from your results - this makes it more precise.
Good luck
0
8 years ago
#3
I have the mark scheme here for that exact question ( I did my biology ISA this past week, this question came up!) and it says:
1st mark - A statement is made that a mean should be calculated,
2nd mark - by adding the results together and dividing by the numbers of values.
3rd mark - a statement is made that either anomalous results are discarded before calculating the mean or a graph is blotted and a best fit line is drawn ignoring anomalous points.

I would go for the former statement in regard to the 3rd mark... much easier.

Hope I helped!
1
8 years ago
#4
(Original post by laylarose)
I have the mark scheme here for that exact question ( I did my biology ISA this past week, this question came up!) and it says:
1st mark - A statement is made that a mean should be calculated,
2nd mark - by adding the results together and dividing by the numbers of values.
3rd mark - a statement is made that either anomalous results are discarded before calculating the mean or a graph is blotted and a best fit line is drawn ignoring anomalous points.

I would go for the former statement in regard to the 3rd mark... much easier.

Hope I helped!

I just done mine too
Hopefully I've got the three marks on that question
0
8 years ago
#5
Strictly speaking, repetition of results would increase precision, it would do nothing to improve accuracy.
0
8 years ago
#6
you need to write something like this;

By repeating my results it enables you to checkyour results with those ofothers to see if there areany similarities ordifferences.With more results youare able to calculate amore accurate meanand minimize the effectof random errors. This enables reproducibility
to be confirmed.

i got three marks for this.
1
8 years ago
#7
Can show anomalies when you can comparing result.

Can therefore dispute a data value and calculate a more accurate mean.
0
6 years ago
#8
check results with others
minimise effect of random errors
confirm reproducibility

However, having more results to generate a mean does not in itself make the results more accurate. If you have a zero error making every result biased, that won't go away in the averaging process. Random errors are spread about the mean and so they go away when you do the average.
0
6 years ago
#9
(Original post by Marc707)
Strictly speaking, repetition of results would increase precision, it would do nothing to improve accuracy.

Actually, repeating doesn't improve precision. Precision is the spread of your results about the mean. So if your results are hugely different from one another, they are not precise.

So.. repeating doesn't improve precision OR accuracy. So you might wonder what it does improve. It reduces the effect of random errors, which MIGHT make your result more accurate as long as you don't have significant systematic errors. It also helps you check that your results are reliable ie you can get the same results over and over again (repeatable) and that your results fit with what other people found (reproducible).
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### What factors affect your mental health the most right now?

4.85%
Uncertainty around my education (411)
14.66%
Uncertainty around my future career prospects (315)
11.24%
Lack of purpose or motivation (393)
14.02%
Lack of support system (eg. teachers, counsellors, delays in care) (127)
4.53%
Impact of lockdown on physical health (170)
6.06%
Loneliness (244)
8.7%
Financial worries (101)
3.6%
Concern about myself or my loves ones getting/having been ill (113)
4.03%
Exposure to negative news/social media (130)
4.64%
Lack of real life entertainment (151)
5.39%
Lack of confidence in making big life decisions (245)
8.74%
Worry about missed opportunities during the pandemic (267)
9.53%