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Question 1156488: The table below shows the world record in the men’s 100-meter dash from 1912 to 2009. Use this to answer Questions 5 - 8. (Note: A change to electronic timing in the 1970s might explain the 30-year gap in records from 1968 to 1999.)
Men's 100=meter dash2
Year World Record Time
(nearest tenth)
1912 10.6
1921 10.4
1930 10.3
1936 10.2
1956 10.1
1960 10
1968 9.9
1999 9.8
2008 9.7
2009 9.6
Start of Questions
Create a scatter plot on paper - it's best to do this on graph paper - using the data relating year and world record time on the 100 meter dash. Let the horizontal axis represent years, t, where t is the number of years after 1900. The vertical axis represents R, the time in seconds of the record 100 meter dash. Use a straight edge to draw the line you think is the best linear model for this data. Write the equation of that line here.
R = =-0.028t+20.8=18
Answer by ikleyn(52786)   (Show Source):
You can put this solution on YOUR website! .
When I completed to read this post, I was in trouble.
Should I really take a straight edge and a paper and do your work instead of you ?
Should I write an equation, while it is just written (incorrectly) in your post ?
I will give you BETTER ADVISE.
Go to any of these web-sites with free of charge online calculators (any one of referenced below)
https://www.graphpad.com/quickcalcs/linear2/
http://www.alcula.com/calculators/statistics/correlation-coefficient/
https://www.answerminer.com/calculators/correlation-test/
http://www.endmemo.com/statistics/cc.php
Read instructions and description.
Input your numbers.
Press "CALCULATE" button.
Get the result in seconds, even in the graphical form.
As a reminder for you : we live just in the 21-th century.
It is just the era of computers.
The era of iron and steam is just FAR BEHIND.
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After re-reading my post, I have serious doubt, if my writing makes sense at all,
as the only your job is to copy and paste from the given source
and then to submit to the forum, even without reading your submission.
Am I right ?
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