I finally understand this chapter after relentless attempts... thank you very much.

@BicenMaths

Жыл бұрын

You're welcome - and well done for persisting, it is a tough chapter!

'millimilli..HAEMOGLOBIN😭' fun fact: mmHg actually stands for 'millimetres of mercury'

@ravjayakodi2746

6 ай бұрын

lmao

16:50 if we're trying to find those with a blood pressure HIGHER than the 95th percentile, wouldn't we be looking to the right so P(X>a) or is that incorrect?

big thanks to you :)

@BicenMaths

Жыл бұрын

You are welcome!

thank you

Awesome thanks

Sir, for question d on the last exercise I thought that a=0.8416 was the value for when the area=0.8 so wouldn't you do 0.8416 - P(Z< -a) to get the area for 0.6?

@joannadaniel9396

Жыл бұрын

0.6 is the area which is already given, we're working out the boundaries which is a and -a

Hi Sir, not particularly related to this question but I'm just having a look over the large data set and I am wondering what I should actually do with the piles of data provided on it? How will this be assessed in the exam? Do I have to remember particular examples or just the nature of each location?

@BicenMaths

3 ай бұрын

I just go with the nature of each location, and the units that things are measured in - that seems to be the only things they've assessed. And some common sense stuff around correlation - like 'higher temp correlates with amount of sunshine per day' for example.

How would you know when to use the standardized version if you could just use inverse e.g 17:50. Or are both methods valid there?

@BicenMaths

Жыл бұрын

Honestly, I just always use inverse on my calc - this video is a bit redundant in my opinion, I only ever use the standardised version when there is a missing mu or sigma (mean or s.d. not known for the distribution).

@booperdooper7159

Жыл бұрын

@@BicenMaths Thank you!

so should you not use the values that describe what percentage of data is within a certain standard deviation for calculations? (eg : 95% of data is within 2.s.d.)

@BicenMaths

6 ай бұрын

No, you can use that, but it's not exact, so best to use more exact values from calc. (I think this is what you are asking!)

@ravjayakodi2746

6 ай бұрын

@@BicenMaths yh it is , thanks for answering.

Hi, you said previously in a comment this is part of the old spec? So is it irrelevant for me to know this as it cannot come up in exams?

@BicenMaths

5 ай бұрын

Yeah this isn't necessary - I never get my students to learn this.

@voltagexzz6394

4 ай бұрын

@@BicenMaths do you not need to know this for finding the mean and standard deviation

@BicenMaths

4 ай бұрын

@@voltagexzz6394 You do - but you don't need to be able to do all the z-values stuff. No harm in looking at it though.

@voltagexzz6394

4 ай бұрын

@@BicenMaths ok thank you

Sir, for part c, I used the table method and found out the value to be positive 0.5244. Would I then have to use common sense to see if a is positive or negative?

@BicenMaths

Жыл бұрын

Yes that’s the right approach!

I don’t really understand how to use the z-value table here for part c) or d) 24:00

@BicenMaths

Жыл бұрын

I actually don't even teach Z values anymore - it's not at all necessary and any students in my class haven't been shown it. So you can leave it! It's a legacy from the old specification.

@amyrahadeleye7277

Жыл бұрын

@@BicenMaths would you say z values aren't needed for the exams or just the table specifically?

@BicenMaths

Жыл бұрын

Not needed for the exams at all

@Rua1557

Жыл бұрын

@@BicenMaths ok, thank you! It was really confusing me so glad I don't have to worry about it

@rollasix7238

Жыл бұрын

Wait so is this whole video not necessary anymore?