Thank you so much for this! This is the only bit of stats that actually makes sense now!I cannot express how happy i am that i found this video! You're brilliant! !
There are two different types of standard deviation; one is used if we have knowledge of the entire population (this is the one you have used) and it gives an answer of 15.22 The other, is if we have a sample from the population, and that gives 16.15. Either is acceptable, AQA Biology doesn't discriminate. For future reference, Population SD has 'n' on the bottom, Sample SD has 'n-1' on the bottom.
James Pollock That makes sense, thank you very much! Also, if the error bars don't overlap, would you say that there is a 5% probability that the differences in results are due to chance. As a result the null hypothesis should be rejected?
No problem. Perfect answer would be: Error bars OVERLAP so ACCEPT null hypothesis; this means there is a GREATER THAN 5% probability that results occurred due to chance. or Error bars DO NOT OVERLAP so REJECT null hypothesis; this means there is a LESS THAN 5% probability that results occurred due to chance.
James Pollock I seee! I'll definitely learn this in case Standard Error comes up in the ISA that I have this week. Thank you Sir. Thanks ever so much for taking the time out to reply to this and also putting the effort in to making these videos. They are really useful! Will you be uploading further videos on Unit 5 by any chance?
What if you hypothesis was instead " there will be a significant difference between hands spans in males and females". That wouldnt work for the generalisation you gave?
That would not be an appropriate null hypothesis. Your null would be 'no difference in handspan between males and females' then if your statistical test tells you to reject your null, then you're showing there is a difference
can you please give me the equation of the SD, cuz my SD result was 15.24 for male rather than 16.15. It's really weird . My way is root((X^2)*(1/9)-206.11^2)
+LuLuLay Mr Pollock1 year ago There are two different types of standard deviation; one is used if we have knowledge of the entire population (this is the one you have used) and it gives an answer of 15.22 The other, is if we have a sample from the population, and that gives 16.15. Either is acceptable, AQA Biology doesn't discriminate. For future reference, Population SD has 'n' on the bottom, Sample SD has 'n-1' on the bottom.
Thank you so much for this! This is the only bit of stats that actually makes sense now!I cannot express how happy i am that i found this video! You're brilliant!
!
Many thanks for the kind words!
For your worked example I got a SD of 15.22 instead of 16.15 (6:55). I just don't understand what I'm doing wrong on the calculator.
There are two different types of standard deviation; one is used if we have knowledge of the entire population (this is the one you have used) and it gives an answer of 15.22
The other, is if we have a sample from the population, and that gives 16.15.
Either is acceptable, AQA Biology doesn't discriminate.
For future reference, Population SD has 'n' on the bottom, Sample SD has 'n-1' on the bottom.
James Pollock
That makes sense, thank you very much!
Also, if the error bars don't overlap, would you say that there is a 5% probability that the differences in results are due to chance. As a result the null hypothesis should be rejected?
No problem.
Perfect answer would be:
Error bars OVERLAP so ACCEPT null hypothesis; this means there is a GREATER THAN 5% probability that results occurred due to chance.
or
Error bars DO NOT OVERLAP so REJECT null hypothesis; this means there is a LESS THAN 5% probability that results occurred due to chance.
James Pollock
I seee! I'll definitely learn this in case Standard Error comes up in the ISA that I have this week. Thank you Sir.
Thanks ever so much for taking the time out to reply to this and also putting the effort in to making these videos. They are really useful! Will you be uploading further videos on Unit 5 by any chance?
Imran Khan Best of luck with that.
think you missed out the terms, "5%" and "chance".
Nice and concise. Thank you
Great video!
What is the difference between Standard Error and Standard Deviation??
Please help!
What if you hypothesis was instead " there will be a significant difference between hands spans in males and females". That wouldnt work for the generalisation you gave?
That would not be an appropriate null hypothesis. Your null would be 'no difference in handspan between males and females' then if your statistical test tells you to reject your null, then you're showing there is a difference
Sadaque Khan There is a specific hypothesis he is talking about - look up the "null hypothesis", or the Chi number, which is a special thing.
wannabebrittishgirls do you do aqa biology?
I do IB biology, but he specifically mentioned the "null" hypothesis, which analyses what the chance is that something happens, in very basic terms
What's ib biology ? And do you know anyone that does?
Is this the same as the student t test?
can you please give me the equation of the SD, cuz my SD result was 15.24 for male rather than 16.15. It's really weird . My way is root((X^2)*(1/9)-206.11^2)
+LuLuLay
Mr Pollock1 year ago
There are two different types of standard deviation; one is used if we have knowledge of the entire population (this is the one you have used) and it gives an answer of 15.22
The other, is if we have a sample from the population, and that gives 16.15.
Either is acceptable, AQA Biology doesn't discriminate.
For future reference, Population SD has 'n' on the bottom, Sample SD has 'n-1' on the bottom.
My answer was 15.24 tho
Thank you so much!! This video really helped :)
Not a problem; guessing you've got an ISA coming up!
as soon as I finish this course I am never coming back to this. Im meant to be learning bio not fucking maths, there's a reason I dropped it.
You deserve more likes Jesus Christ