anonymous
  • anonymous
The graph below shows the relationship between the number of months different students practiced baseball and the number of games they won: Part A: What is the approximate y-intercept of the line of best fit and what does it represent? (5 points) Part B: Write the equation for the line of best fit in slope-intercept form and use it to predict the number of games that could be won after 13 months of practice. (5 points)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
any help would be appreciated
anonymous
  • anonymous
@Nnesha @Astrophysics

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More answers

jim_thompson5910
  • jim_thompson5910
do you see what the y-intercept is?
anonymous
  • anonymous
well i know that the y-intercept is the place where a line crosses the y-axis
jim_thompson5910
  • jim_thompson5910
which is where in this case?
anonymous
  • anonymous
is it the second dot ? ike 0,1?
jim_thompson5910
  • jim_thompson5910
focus on the line and not the dot. The dot is a bit below the line
jim_thompson5910
  • jim_thompson5910
So it's probably around (0,1.5) maybe
anonymous
  • anonymous
so what do i do?
jim_thompson5910
  • jim_thompson5910
do you agree that the y-intercept is around (0,1.5) ?
anonymous
  • anonymous
well i said 1 so why is it 1.5?
jim_thompson5910
  • jim_thompson5910
I zoomed in and saw that the point at (0,1) is slightly below the place where the line crosses the y axis
jim_thompson5910
  • jim_thompson5910
|dw:1438992422113:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1438992436303:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1438992467887:dw|
anonymous
  • anonymous
oh alright i see now
jim_thompson5910
  • jim_thompson5910
what does it represent?
anonymous
  • anonymous
the numbers of games they won?
anonymous
  • anonymous
is that what it means
jim_thompson5910
  • jim_thompson5910
what is the line of best fit trying to do?
anonymous
  • anonymous
i dont know ...
jim_thompson5910
  • jim_thompson5910
we have a bunch of points and the line of best fit is trying to get as close as possible to each point, right?
anonymous
  • anonymous
yeah
jim_thompson5910
  • jim_thompson5910
the line of best fit is a tool used to predict y scores based on given x values if we know the number of months practiced, then we can use it to predict the number of games one based on the regression line
jim_thompson5910
  • jim_thompson5910
what is the x value at the y-intercept?
anonymous
  • anonymous
0
jim_thompson5910
  • jim_thompson5910
when the number of months of practice is 0, the predicted number of games won would be around 1.5 that's what the y-intercept tells us
anonymous
  • anonymous
thanks i know ive been hard work haha could you help me with the other part
jim_thompson5910
  • jim_thompson5910
you'll first need to write down all of the points shown on the graph make one big list of points
anonymous
  • anonymous
alright
jim_thompson5910
  • jim_thompson5910
once you have your list, paste it into http://www.alcula.com/calculators/statistics/linear-regression/ to calculate the regression line
anonymous
  • anonymous
this will give me the equation?
anonymous
  • anonymous
ok i filled it in
jim_thompson5910
  • jim_thompson5910
yeah it should be calculated/shown after you hit the "submit data" button
anonymous
  • anonymous
it just shows the graph ?
jim_thompson5910
  • jim_thompson5910
I think the equation is shown above the graph
jim_thompson5910
  • jim_thompson5910
above where it says "Regression line equation:"
anonymous
  • anonymous
/.Sample size: 10 Mean x (x̄): 4.8 Mean y (ȳ): 10.85 Intercept (a): 1.9772727272727 Slope (b): 1.8484848484848 Regression line equation: y=1.9772727272727+1.8484848484848x
jim_thompson5910
  • jim_thompson5910
so y=1.9772727272727+1.8484848484848x
anonymous
  • anonymous
thats the equation ?
jim_thompson5910
  • jim_thompson5910
I was pretty close. 1.97 is close to 1.5 well closer to 2 actually
jim_thompson5910
  • jim_thompson5910
yeah
anonymous
  • anonymous
so do i change part a to 1.97
jim_thompson5910
  • jim_thompson5910
no that was an estimate based on just looking at the graph
jim_thompson5910
  • jim_thompson5910
it doesn't have to be perfect
anonymous
  • anonymous
oh alright thanks bunches
jim_thompson5910
  • jim_thompson5910
no problem

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