The Effects of Transforming Data on Spread and Centre (1.4)

[@Simplelearningpro]

Hi, I would like to clear up some possible confusion in this video. The confusion in this video seems to stem from the unit conversions, with the question not being very clear about what units the answer should be presented in. So I would like to clarify that now. If you pause at 4:20 of the video we can clearly see the calculations for the new mean and new standard deviation. The units were not included in the video to try to make things a little simpler, but this was a mistake since it does not show the unit conversion. So in fact, the calculations should have been presented as follows: x̄, new = (135.6 pounds)(2.5mL/pound) + (750mL) = 1089 mL s, new = (31.75 pounds)(2.5mL/pound) = 79.38 mL When presented in this manner, we can clearly see that the units of pounds cancels out since a pound divided by a pound is just equal to one. As a result, we end up with a new mean and a new standard deviation in units of mL, even though the original mean and standard deviation was in units of pounds. I hope this helps. I would like to take this moment to apologize for this confusion. For all of my videos, I put in over 100+ hours of work into every video while doing my best to fact check the information that I present. In this case, I left out an important detail and I am truly sorry for it. This video is 5 years old and I have improved a lot since then. Many of my newer videos are better animated and have better visual and auditory explanations to help aid your learning. I apologize if this video has brought you inconvenience and confusion. I always read the comments and answer any questions, as I am always happy to help since I believe that education should be free, easy and fun. With that being said, if you have any questions about this video or any of my other videos, please leave a comment and I will get back to you as soon as possible. Thank you for your time and I would like to apologize again for any confusion.

[@ter9368]

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[@alpcetinkaya3656]

Your videos are great, thank you. I saw the unit conversion error but no problem I got the point.

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[@cremebrulee6667]

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[@Simplelearningpro]

Thank you :)

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[@Simplelearningpro]

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[@MrYouitube]

Just remember that the water additions are in ml and their body weights are in lbs..

[@jespercairowestergaard4498]

Yeah. I caught that one too. Converting the 2,5 milliliters of water to pounds is 0.0055 pounds; so it seems to me the multiplicative should be 1.0055 instead. Otherwise great video.

[@nahuel3256]

and apart from that, even if the mass was in kg I think it should be 105 + 105 * 2.5E-3 + 750E-3 Because the amount of water mass intake proportional to the weight should be added to the weight

[@nahuel3256]

otherwise great video!

[@MultiSciGeek]

Idiotic mistake. Made me doubt myself for a second.

[@RyanJohnsonD]

Isn't the "s" of standard deviation a greek Sigma?

[@Simplelearningpro]

"s" is the standard deviation of a sample, whereas sigma is the standard deviation of a population. This is explained in video 5.2 of my statistics series if you would like to look into it further :) hope that helps Ryan!

[@humarauf9115]

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seen

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[@MultiSciGeek]

4:20 How the heck does that work? While calculating x̄new, not only are you mixing up the orders of magnitude (litre to millilitre), but you're adding together metric with imperial (pounds to kg), and not only that, you're confusing volume and weight! You added millilitres to pound! My man, you have some explaining to do because that logically DOES NOT MAKE SENSE! You're telling me a kid went from 135 pounds to 1089 pounds because he drank < 3 litres of water? THINK. I went ahead and calculated x̄new with all the units converted and in the same order of magnitude, and the answer is 137.945! Not 1089! Like you're trying to show us a shortcut, but apparently it doesn't work lol... Screw this. I can't trust this series anymore.

[@Simplelearningpro]

Hi there, not once in the video did I mention that a kid went from 135 pounds to 1089 pounds. That would be nonsense. It is 1089mL of water that was consumed on average for each kid. If you read the question, it actually asks for the amount of mL consumed every day, nothing about pounds. I apologize for losing your trust with this video. I should have explained the unit conversions in this video. So for example, we have (135.6 pounds)(2.5mL/pound) + (750mL) = 1089mL, so in this instance, you can clearly see that the units of pounds is cancelled out and we are left with mL for the final answer. I do my best to fact check my videos and I put in over 100+ hours per video that I create. With that being said, I am disappointed in myself that I have lost your trust and it wasn't enough. This video is 5 years old and I have improved since then. Many of my newer videos are better animated and have better visual and auditory explanations so I hope that you can give this series another chance. I can assure you that for all of the videos I create currently, I put in twice the amount of effort so that my viewers can put more trust in me. I apologize again for any inconvenience that I have caused you but I hope my explanation helped. If you have any other questions I would gladly be able to help. Nevertheless, thank you for your comment!

[@reygaji4001]

This is not an airport, no need to announce your departure.