anonymous
  • anonymous
Trend lines! PLEASE help!!
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Reposting under the Algebra section. I need help with 7 and 8
anonymous
  • anonymous
do you still need help
anonymous
  • anonymous
Yes. Sorry I had to log off for a bit, but yes I am in desperate need if you are still here

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jim_thompson5910
  • jim_thompson5910
are you allowed to use technology? like a calculator or excel or open office?
anonymous
  • anonymous
I have a graphing calculator, TI-84 I don't think I'm allowed to use excel, open office, etc
jim_thompson5910
  • jim_thompson5910
ok let's use a TI84 then
anonymous
  • anonymous
Okie, thanks!!
jim_thompson5910
  • jim_thompson5910
hit the STAT key (under the DEL key) then hit enter to get into the edit list menu
anonymous
  • anonymous
I have the points entered for #7 already. The years are in L1 and the prices in L2
jim_thompson5910
  • jim_thompson5910
ok so your data is already inputted, good
jim_thompson5910
  • jim_thompson5910
now go back to the home screen (2nd -> quit) then hit the STAT key again, go to the CALC menu (scroll once to the right) and then scroll down to `4:LinReg(ax+b)`
anonymous
  • anonymous
All right, I did that and then entered to "calculate", and I have the results from that
jim_thompson5910
  • jim_thompson5910
what do you see?
anonymous
  • anonymous
I got y=ax+b a=1616.785714 b=-3116482.143
anonymous
  • anonymous
The reason I am confused on this problem is because those values don't seem to match any of the answers
jim_thompson5910
  • jim_thompson5910
hmm strange how none of the answer choices match
anonymous
  • anonymous
Yeah, that's what I'm confused on, lol!!
anonymous
  • anonymous
I know my teacher made other mistakes on this test, so maybe this is one as well.
jim_thompson5910
  • jim_thompson5910
ok I've figured it out. It's strange how your teacher went about this way instead of doing a true regression, she simply picked 2 points. In this case, the first and last points (0,20200) and (60,119000) the line through those two points is y = 1646.67x + 20200 then you plug in x = 80, since 2020-1940 = 80, to find the estimated median home price in the year 2020
jim_thompson5910
  • jim_thompson5910
I noticed that each answer choice had a y-intercept of 20200 so that meant that she made x = 0 when the year was 1940
anonymous
  • anonymous
OH! So, just to make sure I understand, if I use the years as "0,1,2,3,4,5,6" instead of "1940,1950,etc" I will calculate the right answer?
jim_thompson5910
  • jim_thompson5910
more like 0,10,20,30,40,50,60
anonymous
  • anonymous
OH! Okay!! Thank you so much!! I think I will be able to understand 8 as well. Thank you thank you!!
jim_thompson5910
  • jim_thompson5910
you're welcome

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