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anonymous

  • one year ago

Trend lines! PLEASE help!!

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  1. anonymous
    • one year ago
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    Reposting under the Algebra section. I need help with 7 and 8

  2. anonymous
    • one year ago
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    do you still need help

  3. anonymous
    • one year ago
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    Yes. Sorry I had to log off for a bit, but yes I am in desperate need if you are still here

  4. jim_thompson5910
    • one year ago
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    are you allowed to use technology? like a calculator or excel or open office?

  5. anonymous
    • one year ago
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    I have a graphing calculator, TI-84 I don't think I'm allowed to use excel, open office, etc

  6. jim_thompson5910
    • one year ago
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    ok let's use a TI84 then

  7. anonymous
    • one year ago
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    Okie, thanks!!

  8. jim_thompson5910
    • one year ago
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    hit the STAT key (under the DEL key) then hit enter to get into the edit list menu

  9. anonymous
    • one year ago
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    I have the points entered for #7 already. The years are in L1 and the prices in L2

  10. jim_thompson5910
    • one year ago
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    ok so your data is already inputted, good

  11. jim_thompson5910
    • one year ago
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    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)`

  12. anonymous
    • one year ago
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    All right, I did that and then entered to "calculate", and I have the results from that

  13. jim_thompson5910
    • one year ago
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    what do you see?

  14. anonymous
    • one year ago
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    I got y=ax+b a=1616.785714 b=-3116482.143

  15. anonymous
    • one year ago
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    The reason I am confused on this problem is because those values don't seem to match any of the answers

  16. jim_thompson5910
    • one year ago
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    hmm strange how none of the answer choices match

  17. anonymous
    • one year ago
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    Yeah, that's what I'm confused on, lol!!

  18. anonymous
    • one year ago
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    I know my teacher made other mistakes on this test, so maybe this is one as well.

  19. jim_thompson5910
    • one year ago
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    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

  20. jim_thompson5910
    • one year ago
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    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

  21. anonymous
    • one year ago
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    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?

  22. jim_thompson5910
    • one year ago
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    more like 0,10,20,30,40,50,60

  23. anonymous
    • one year ago
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    OH! Okay!! Thank you so much!! I think I will be able to understand 8 as well. Thank you thank you!!

  24. jim_thompson5910
    • one year ago
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    you're welcome

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is replying to Can someone tell me what button the professor is hitting...

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