OCR A level Biology Spearmans rank Correlation coefficient

OCR A Level Biology A
4.2.2. Classification and Evolution
www.buymeacoffe...
Spearman’s rank correlation coefficient to consider the relationship of the data.
#ClassificationAndEvolution #SpearmansRank #StatisticsBiology #MathsInBiology #Probabilty #ALevelBiology #ALevelBiologyOCR
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[@beatrizbantot3474]

This is so quick and helpful !! Gets straight to the point :)

[@lilia_casburn]

As a side note, sometimes there is an extra mark you may be rewarded if you say e.g. any difference is due to chance if we accept null hypothesis, and that we could also look into the >0.05 critical value if it is given and say that e.g. we can accept the null hypothesis for 0.05, but for a variation of 0.10 we can reject null hypothesis!

[@clarebiology2858]

yes this is a fantastic point to make 👍

[@clumsy7328]

thank you so much! this is so helpful:)
would you please be able to do a video on all the stats tests required for ocr? that would be absolutely incredible, as maths isn't my strongest skill, all the love!

[@clarebiology2858]

thanks for the request, i’ll try and get them covered 👍

[@tanaypandya251]

Is there any chance you can complete the manipulating topic I am struggling and your videos are amazing

[@user-gi3yr1gl7j]

same

[@eleanorchem]

You’re a lifesaver !

[@ZainKhan-lc7fi]

real talk , test is today lets see how it goes ... exam questions for me personally aint looking gooodddd.

[@beatrizbantot3474]

@@ZainKhan-lc7fihow did the test go

[@ZainKhan-lc7fi]

@@beatrizbantot3474 it was 50-50 some good parts i heavily revised others i lightly revised, how did you find it?

[@luhuzeeeevuhrt]

Do you not need to do n-1 when you’re trying to find degrees of freedom on 3:43 so would it not be comparing 0.7 with 0.950 (n=4)?

[@clarebiology2858]

df = n-1 where n is the number of pairs

[@luhuzeeeevuhrt]

@@clarebiology2858can you elaborate please you’ve done 2 rankings doesnt that count as a pair?

[@dareamohammed4954]

Hi can you make the rest of the videos for 4.2.2 please because your videos are the most helpful 😭

[@clarebiology2858]

yes i need to get on this! thanks for the reminder!!

[@masoud1082]

hi at 4:36 why is the rank 4.5 and not 4. Thanks again for the videos

[@clarebiology2858]

you only have two numbers are the same so you are sharing the rank 4 and 5 between two numbers. Therefore they both get 4.5 and the next number you start off at six. Hope that helps.👍

[@masoud1082]

So if the first rank has 2 or more of the same number e.g ranked 3 then if there is a number in rank 2 that is the same then it would be ranked 3.5

[@clarebiology2858]

I’m a bit confused by your comment, watch the video again and hopefully it will make more sense 🤞

[@masoud1082]

@@clarebiology2858 it makes sense now after watching again thank you

[@aysetankisi-u7y]

for the last example for 2006 isn't it 1-6 =-5

[@obaydahJ-b2o]

it doesnt matter because youre going to square the number anyway and its going to become positive

[@s.s4661]

hi Claire, I was just wondering, can this topic come up in paper 1 even though it’s modulus 4?

[@clarebiology2858]

spearman’s rank? technically it is a maths skill that could come up in any paper 👍

[@fo0426]

Do you have to rank them from lowest to highest or can it behighest to lowest top ??

[@clarebiology2858]

usually lowest to high but as long as you treat both sets of data the same you should come out with the same answer.👍