WST01/01, (Edexcel) IAL S1 June 2022, Q2, Correlation & Regression, PMCC, Regression Line
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- Опубліковано 28 вер 2024
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Why don’t we use the full regression line in part f and just the gradient
in part f, why didnt we use the full regression line
Because we're only comparing the gradient
Hello, in part f, why did you use one of the calculator functions to get the answer, and it isn't simply 3.21
19:11 how are you certain that 7 is out of the data range? It could be that 7 is part of the data and all the others are low values, adding up to a total of 7.87 right?
Then the value of r would not be so close to 1... there is almost perfect positive correlation
hi sir, your videos are really really helpful and thank you soooooo much for posting and explaining all these questions🥺!
But for the last part isn’t x should be 3.21 million as the answer in the video was in billions?
it says in the question t (our x value) is measured in millions so when we solve for it it’s alr in that unit🙏
Hi sir, in part e)ii) Why did u use mean of t to find the range of data and come to conclusion that t=7 is out of range? I thought since t=7 and summation of t is 7.87, so t=7 will be in range?
The sum of all 9 years populations is 7.87 million... the sum.... so thay means the population in any one given year will be wayyy lower than 7 million... at least 1/9 th of it. So using the regression line to predict for t = 7 is not appropriate
this is what i understood:
7.87 was the "summation" of t for 9 years. let's say in year 1, the t's value is for e.g: 1 or 1.2 and for year 2, t=0.5 etc. they added all these values of t for each of 9 years straight and that's how they got 7.87. and in part e(i) they provided a data, where in one year the t=7 which is quite high comparing to the mean or avg. values of t, which we took into consideration when adding up all of the t values for each of 9 years and finally getting t=7.87 .
thank you sir, well explained
sir in these types of questions, how do we tell which one is the x and which one is the y
Watch from 9:50... if they ask for the regression line of g on t.... compare that to the formula sheet where is mentions the line of y on x... so g on t.... y on x... g is y and t is x
@@MrHassaansMathsChannel thank you sir!
@@MrHassaansMathsChannel thank you so much sir i get it nowm this used to be soimething i was really confused with
sir I just wanted to let you know you didn't post the Question 1 of this paper!
i did... here it is... its in the playlist as well ua-cam.com/video/osDGI_67W7c/v-deo.html
@@MrHassaansMathsChannel oh thank you sir !!