Regression & Correlation 4 • Hypothesis Tests • Stats2 Ex1C • 🎲

Edexcel Applied Year 2 - Statistics

Thurs 19/3/20

[Harry_B]

Thank you very much for these videos since the start of yr 13 this September I’ve gone from getting B/C to almost straight A
in my maths tests at school and feel much more confident about tackling questions. I wish i had known about your channel in yr12. Better late than never!

[Rua]

10:20 I’m quiet confused as to why we don’t reject null hypothesis here as I thought the value of r here is greater than the threshold to be significant

[Toby-zqwk]

these are brilliant, any chance you know any of these kind of videos for physics :)

[shahinaozod]

when we have a hypothesis testing and the equation they give tells us that x is a base so its not a power to anything and the x and y are equal to logs of something else, we still use the y=a+bx to find the pmcc of the coded data right?? in a level, will we have to use any other option than y=a+bx bc i domt remember doing questions where we didnt use that option

[elliestubbs]

for the question at 21:02 why do we reject h0 when 0.5822 is less than 0.609 when the previous example did the opposite?

[MBaby-hxwl]

Hi sir, in the previous page you said to reject h0 as r was greater than cv however in the first TTT Example you said to reject H0 even though r was smaller than the cv . I’m confused
Could u please explain 😅

[kuba]

hello seb, i am currently cramming for paper 3 thats happening next week. any tips? also, i cant find these product momeent coefficient tables in the formula booklet, where is it?

[mehdih]

so even for two tailed you can just show evidence using only one tail and thats enough for the marks? if you find no correlation from one tail you dont need to check the other tail for correlation because its symmetrical so the result is the same?

[missachin]

Are there scenarios where you have to manually log the data in the table ? Also how would you determine which column to log if not both ?

[acelx]

8:05 does this include being equal to 0.4428 too, or strictly greater than?

[wel_r]

Hi sir is there anything we need to know about the spearmans coefficient?

[bryanmamomoto]

Hello sir, For 14:17 the r value < critical value so why was it not kinda accepted and for 10:26 the r value <CR but it's kinda accepted? and I'm honestly getting confused with the signs is there a way to remember it?

[fatmabatmaz]

Why is r being close to -1 suggesting an exponential model is appropriate? and also what is an explanatory variable?

[nerimaken]

For the question at 21:06, why does the answer for part e) suggest using data from one place only?

[hxvoc_]

How do we know its two tailed at 12:20