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9.42NotesHernstein & Murray evoke the idea of the bell curve to help justify their work: While the video does not explicitly state the underlying critique of &q...

Question

9.42NotesHernstein & Murray evoke the idea of the bell curve to help justify their work: While the video does not explicitly state the underlying critique of "The Bell Curve it hints at it by showing that Hernstein Murray's theory on intelligence and IQ is primarily dependent on genetics: Moreover; the video goes on to say that individuals with poor genetics tend to live in poor areas, attend poor school; and ultimately have poor life outcomes (see the giraffe example) Is there an

9.42 Notes Hernstein & Murray evoke the idea of the bell curve to help justify their work: While the video does not explicitly state the underlying critique of "The Bell Curve it hints at it by showing that Hernstein Murray's theory on intelligence and IQ is primarily dependent on genetics: Moreover; the video goes on to say that individuals with poor genetics tend to live in poor areas, attend poor school; and ultimately have poor life outcomes (see the giraffe example) Is there any bias in Hernstein & Murray'$ theory surrounding why IQ is higher for some individuals and not others?



Answers

Refer to the data in the table below. The IQ score and brain volume are listed for each of five different subjects. $$\begin{array}{|l|l|l|l|l|l|}\hline \multicolumn{2}{|l|} {\text { IQ Score and Brain Volume }} \\\hline \text { Subject } & 1 & 2 & 3 & 4 & 5 \\\hline \text { IQ Score } & 87 & 127 & 101 & 94 & 97 \\ \hline \text { Brain Volume }(\mathrm{cm} 3) & 1035 & 1034 & 1173 & 1347 & 1029 \\\hline \hline \end{array}$$ Conclusion If we were to use such data and conclude that there is a correlation or association between IQ score and brain volume, does it follow at larger brains are the cause of higher IQ scores?

We've got a table of I. Q. Score on top and brain size on the bottom. And uh the first column here is person one person two person three. That's got an I. Q. Score with a brain size. So that means that these are matched to a person. However it wouldn't make sense to do a difference. Uh Since we're looking at like us which is some sort of unit and brain sizes in centimeters cubits, a volume and some sort of immeasurable intelligence thing. So we can say that these pears are matched his front person. But we can't just take the difference to find out like an average of something because there are different units.

Well. The statement here says that in a study of 12 subjects, see, there are only 12 subjects. The sample size is not big enough. First thing to note in a studio 12 subjects using the program, the average increase in like a Nike you score is three I Q points. There is a 25% chance of getting such results if the program has no effect. If there is a 25% chance we can see that this is not statistically significant and even practically I mean, if your I Q score is increasing just by three points, it is quite possible that you are just having a very good day. So if we look at it like that, why would I pay $39.99? Even practically, this seems to be a little dicey.

The company claims that they can increase your I. q. by 10 to 20 points. And the author of this text said that oh well it's actually about three points higher for your I. Q. And there's about a 25% chance that this occurs most likely from the multiple choice being there being four options. So if there's a 25% chance that your I. Q. Goes up by three points. Uh this study that's done or that claim that you can do this the best brain training tool in the market, whatever it's a scan, they're saying that it's gonna be old. This is great. Um When in reality it's most likely to the chance so it's not statistically significant or practically uh statistically and practically not significant. And this is because it's all due to chance. It's just a quick scam to get you $32.

The following problem we're going to be considering brain growth and were given um dysfunction involving these scans of Children's frontal cortex and what we see is we get s a key Is equal to 0.000. Any she cute minus zero point 0486. Yeah. She's square Plus 0.71116. Yeah That's 1.46. Um and looking at this, we want to show that the cortex of Children with superior intelligence reaches maximum thickness around 11 years. So one way we can do this is We have to first take as prime of X. And we end up seeing that we want to solve for zero when we do so we see that there's two points. This one reaches a minimum though this one is going to reach a maximum and it is around 11 years old.


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