Using STANDARD DEVIATION to analyse data in A-level Biology. Help with evaluate the conclusion qs
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- เผยแพร่เมื่อ 8 มี.ค. 2020
- Learn all you could be asked on standard deviation in A-level biology. This includes the definition of standard deviation, why it is more useful than the range and how to use it to indicate significance in analyse or evaluate exam questions.
** corrections at 5.21min. 10.8 is the value instead of 10.2
For past paper questions linked to this topic click these links.
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how is this channel so underrated? miss estruch, I love how you break down these monstrous topics and make them seem like a lot less nightmare-inducing. you're amazing! keep up the great work!
Hello 👋🏻
Thank you!!! 😊
Really glad you find they help demystify topics. That's what I've tried hard to do, stick to the key points for more concise and clear explanations.
Ight cheers g my head hurts less now
ha glad it helped!
My head hurts more as I bumped it while watching it 👍
Thank you for going through this! Im in year 13 and Ive never understood standard deviation until now😳 Got my exam this week, hopefully it goes well!
ah awesome!! Good luck!!!
Miss Estruch, I can't thank you enough honestly. You're genuinely helping so many people and doing it so casually. You're not the hero TH-cam deserves, but you're the hero it needs.
Aww thank you so much, that is so kind. So happy you are finding the videos so helpful
This is by far the best explaination of stadard deviation.
aww thanks! Glad you found it helpful 😊😊
I don’t understand what you mean by over lap and not overlapping in the first table you used about species
6:00 how would I know if there’s an overlap if my values were larger? for example -128 and +146 and so on?
Very well explained, thank you 💫
hi, when you say this can't be assessed in exam - is that for edexcel b as well?
Hi! I'm watching your maths skills playlist and it is so helpful! I know that maths skills make up 10% of the paper in total, but I was wondering if they tend to be more heavily concentrated in one particular paper? (AQA)
Hey no, they are evenly spread typically 😊 Hope the playlist is helping
i am trying to sketch a normal distribution graph based on a mean of 21.8k and sd of 1k with a range of 19-24k with a nominal value of 22k any advice? i have worked out the numbers but not sure how to show on a bell graph
i worked out 19-21.8/2 = -2.8 and 24-21.8/2 = +2.2 i need to show 2 graphs and compare, changing the sd to 21.5 and see which one gives better results closer to 22k.
WOW that was really helpful thank you so much😭😭 I always don't get the marks for these questions because I don't know the right things to say - but you gave a really clear solution so many many thanks, I will go practice some now!!
Good luck with the practice questions, hopefully you'll start to see you gain more marks 😀 Really pleased it helped you understand this skill better
Miss Estruch, I genuinely hope someone gives you a massive hug lol. Thanks so much for this.
haha thanks 😊 Hope it helped you understand statistical analysis
Have my mock tomorrow, thank you!!
I hope it helps you Emma!
Good luck
Can you tell me how to calculate 95% intervals? Or do you have a vid on it? My exam is tmrw pls help
Thank you your videos are a great help!
So glad they are helping you 😊😁
You are saving my mock grades, thank you!
Awwww so glad! Good luck 👍🤞
This vid is awesome, thanks for being a LOT of assistance.
so pleased it helped!!
thank you very much, you're awesome at being a teacher!
aww thank you. So happy to help ☺️
Hi Miss,
Thank you very much for making such informative videos. Will we ever be required to use the S.D formula?
You're welcome 😊 No you won't in a biology A level exam.
Brilliantly explained thanks
Thank you! I always found maths at school so have put a lot of effort in as a teacher to fully understand and explain in a way that hopefully all can understand.
Hello, thank you so much for explaining this with so much clarity! Is it possible to link the standard deviation 'bars' on the bar graph to talk about the reliability of the results? For instance, can we say that since the standard deviation overlaps between A and C, they are less reliable?
the overlap doesn't link to reliability. It just shows there is no significant difference.
If the standard deviation is large then the reliability is low, as the repeats must vary a lot from the mean.
hope that helps 😊
@@MissEstruchBiology Thank you so much!
@@MissEstruchBiology what does significant difference mean?
how do u know they overlap through the table?
ive had a mock with OCR biology that has a standard deviation question worth 4 marks?
This helped me so much thankyou !
I'm so glad!
What if we are asked to draw the error bars
Are there any videos on uncertainty for AQA?
really helpful, thanks alot
You're welcome! So glad it helped you!
Thanks! I have my October exam starting tomorrow and received next to no help from my school so this is very useful!
Good luck for tomorrow!!!
I hope the videos have helped you prepare.
thank you, thank you, thank you
you're very welcome 😄😄
Thank you 🙏
You're welcome 😊 Hope it helps you
so good, thank you.
you're so welcome!
How would you tell if there is an overlap from a table?
See if the value of the mean overlaps when you add/minus the standard deviation.
e.g a mean of 7 (SD +/-1.2) and 8 (SD +/- 0.8) are different BUT if the standard deviation were considered then they would overlap (7 -> 8.2) (8 -> 7.2)
visualise it as the data on a bar chart
could do a video on ratio on graphs and how to interpret them?
Great idea. I will be doing exam qs videos this year, so I'll add that.
You are gem🎉
awww thank you!
Is this for OCR?
It's for AQA, but it will be very similar if not the same for OCR.
8 + 2.8 isn't 10.2 ?
Hello, what minute is that? Ill check for the error 😊
@@MissEstruchBiology 5:20