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anonymous
 one year ago
Help please
anonymous
 one year ago
Help please

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A student is assessing the correlation between the average number of hours of internet browsing and average score on a math test for the students of a class. The table below shows the data: Part A: Is there any correlation between the average number of hours of internet browsing and average score on the math test for the students of the class? Justify your answer. Part B: Write a function which best fits the data. Part C: What does the slope and yintercept of the plot indicate?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1what spreadsheet program do you have?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok so I made my own graph for part A and I found that it has a negative correlation, right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I used geogebra for this graph i just attached

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1geogebra is a good choice

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1you can also use geogebra for spreadsheet work

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yea, so that would be negative correlation right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1at the top go to view > spreadsheet

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1we'll find out

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1oh wait, you already have the points plotted

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1in the input bar below, type CorrelationCoefficient[ then enter the list of points surrounded by curly braces

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1So if you had points A through J, then you would have CorrelationCoefficient[{A,B,C,D,E,F,G,H,I,J}]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0When I press enter it erases

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1where is the algebra tab? can I see that?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1at the top go to View > algebra

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1I'm curious to see what the point labels are

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1for some reason, you did (0.95) twice

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1delete point A then do CorrelationCoefficient[{B,C,D,E,F,G,H,I,J,K}]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1oh I see what happened

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1do you see the lower case letters a though g? how they're all 1 those are the results of you typing in CorrelationCoefficient[{A,B,C,D,E,F,G,H,I,J}] so the correlation coefficient is 1

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1now that I think about it, it might be better to do this sort of command in the CAS

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh ok so it is negative correlation

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1r = 1 means we have perfect negative correlation all of the points lie on the same line

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but hmm not sure why i put 0.95 twice

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1the line has some negative slope

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So part A is negative correlation

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1in the input bar, type FitLine[{A,B,C,D,E,F,G,H,I,J}] and an equation of the line will pop up in the algebra tab

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1or you can pick any two points and find the slope, then use y = mx+b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It never works when i go to the input bar

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1ok go to the CAS then view > CAS

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1type FitLine[{A,B,C,D,E,F,G,H,I,J}] into the CAS

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh ok but your last three points are wrong

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1right, they skipped 88 for some reason

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It should be (3.5,87) and (4,86) and (4.5,85)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so now what does the slope say once you fix that

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1the correlation coefficient r is no longer 1 exactly, but it's still pretty close

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I went to mathway and it said this,....

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1that only works if you consider those two points only

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1but we have to consider all 10 points

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1which is what the FitLine function does

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Well the slope is 2.25 and the y intercept is 95.27... but what does it indicate?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1what do x and y represent?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1look back at the table given in the problem

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do you want the coordinates?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1they define in words what x and y are

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1x = number of hours browsing the internet y = ???

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh y is the score of the math test

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1what does the y intercept represent?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1it's where the x coordinate is 0 right? basically where the graph crosses the y axis

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1the yintercept of the regression line is where the predicted score would be if you spend no time on the internet ie, if you spend no time on the internet, then it is predicted you get a score of 95.27

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1the slope tells us how the score changes as x changes each time the number of hours browsing the internet goes up by 1, the predicted score goes down by about 2.25

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thank you! Thank you! Thank you!!!!!
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