Explanatory and Response Variables, Correlation (2.1)

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[@Simplelearningpro]

Thank you for leaving a comment!

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Superb Explanation and visualization ... thanks 🙏

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Haha thank you! That means a lot to me :)

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[@Simplelearningpro]

Thank you I appreciate this comment!

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[@Simplelearningpro]

Thank you! Doing my best :)

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Are you multiplying the bottom ones? and what do i do with the 821? Thank you

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[@Simplelearningpro]

Doing my best! Thank you for supporting me

[@haneulkim4902]

Thanks! One question, say I have 3 groups and want to see relationship between `GPA` and `study_time` to do this I calculate R for each group and get R = 0.5, 0.3, 0. Can I conclude that group1 has more sensitivy towards `study_time` which implies group1 gain most gain from studying?

[@Bishr2038]

I'm sorry, how did you come up with s for x and y?

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Where can I download pdf of this video?

[@aniawo5119]

Sorry to bother, but how come that when I calculate SD standard deviation sx with excel, manually - it gives me 7.57 and, and when the same data pluck to the SD function on excel it gives me 8.28? I have checked few times, I can't find a mistake in my calcs :( the same for xy. When calculated it is 30.05, but when SD formula used in excel it is 32.91. What am I doing wrong?

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Is your site down?

[@Simplelearningpro]

Yes it is currently down since I do not make enough money to sustain the website. Hopefully I will try to get it back up soon!

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[@deimys1000]

how did you calculated R .. how did you got r= 0,602. Ya missed lot of calculating steps.. what divide or multiply from what... because I dont know.. what / how..

[@Simplelearningpro]

Hi, so in the calculation for r, most of the steps were included in the green box at the top of the video. This is how you will know when to multiply and divide. Each step in the table is used to help us calculate the value of r with respect to the formula that I provided in the video. If you follow along, you should get the same answer. I hope that helps. Additionally, I would like to say that this is a very old video of mine that I created 5 years ago. I will be re-doing this video in the future since I assumed that each viewer remembered how to calculate the mean and standard deviations, and the truth of the matter is that people tend to forget and it's nice to have a review on those topics. But for now, you can look at my previous videos on how to calculate the mean and standard deviations for each of these variables. If you have any other questions please let me know, I hope that helps!

[@ajitkumar15]

What are disadvantages of correlation.Which concept of statistics helps us to over come this disadvantages ?

[@joyyang9396]

even in a strong correlation would you also say there's an explanatory variable and response variable? But I learned that correlation doesn't mean caution.

[@Simplelearningpro]

Yes, correlation does not mean causation even if there is a strong correlation. Hope that helps.

[@joyyang9396]

@@Simplelearningpro thank you for answering, just to clarify this: both experiments and observational studies have explanatory variable and response variable, but in observational study the casual between the variable doesn't necessary exist?

[@Simplelearningpro]

@@joyyang9396 That is correct, both experiments and observational studies have explanatory and response variables. The difference is that in a properly conducted experiment, we can prove whether or not the two variables has a true relationship. Whereas in an observational study, the relationship is just a correlation and is just "casual" like you mentioned and we don't know if the relationship between the two variables is a real one.

[@KashishSolkhiya]

one thing i would like to ask that why you state that when determining correlation , explanatory and response variable are not necessary .

[@aisorederosia]

I'm basically only able to focus on this if I'm playing some sort of music soundtrack behind it; Alien Covenant was the soundtrack I used for this video. Worked like a charm

[@missaster1902]

Nice

[@MissMiniLila]

Isn't the standard deviation 8.29?

[@aseretmedina6985]

I keep on doing the standard deviation and I'm not getting 8.28 for X

[@Simplelearningpro]

You can check my video on standard deviations, where it shows you the formula and how to calculate for it! Hope that helps.

[@jeromebarrera6720]

@@Simplelearningpro I got 8.29 using manual computation and the excel function for Standard Deviation.

[@Kateriname]

standard deviation isnt right