anonymous
  • anonymous
A college football coach wants to know if there is a correlation between his players leg strength and the time it takes for them to sprint 40 yards
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
A college football coach wants to know if there is a correlation between his players leg strength and the time it takes for them to sprint 40 yard. He sets up the following test records the data. Every day for a week he counts how many times each player can leg press 350 pounds. The following week he has each player sprint 40 yards every day. Table shows the average number of leg press repetitions and the average 40 yard dash time (in seconds) for seven randomly selected players. What is the equation of the line of best fit? How many seconds should he expect a player to take to run 40 yards if that player can do 22 leg-press repetitions? Round any values to the nearest 10th if necessary
anonymous
  • anonymous
Leg press (reps) 15, 18, 8, 30, 26, 12,21 40- yard dash: 5.2, 6.3, 6.8, 8.2, 8.0, 5.3, 5.9
anonymous
  • anonymous
@directrix

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Directrix
  • Directrix
Use the online calculator for this. Go over to: http://www.mathportal.org/calculators/statistics-calculator/correlation-and-regression-calculator.php Enter the data as instructed. Then, post here what you got for the line. Then, I'll check it. @Ella_Bear_
anonymous
  • anonymous
@directrix y=4.536+0.107•x
Directrix
  • Directrix
Okay, let me see what I get.
anonymous
  • anonymous
Okay
Directrix
  • Directrix
Here's what I got. We have one more thing to do after this.
1 Attachment
Directrix
  • Directrix
We got the same regression line.
Directrix
  • Directrix
How many seconds should he expect a player to take to run 40 yards if that player can do 22 leg-press repetitions? Round any values to the nearest 10th if necessary
Directrix
  • Directrix
y=4.536+0.107•x y=4.536+0.107•22 Okay, crank this out for y and round to the nearest tenth.
anonymous
  • anonymous
100?
Directrix
  • Directrix
I wonder if this is also supposed to be rounded to the nearest tenth. y=4.536+0.107•x y = 4.5 + .1*x Let me check your work.
Directrix
  • Directrix
I don't see how you got 100 here: y=4.536+0.107•22 y = 6.89 which is 6.9 to the nearest tenth.
anonymous
  • anonymous
I added the 2 numbers together and multiplied by 22.
Directrix
  • Directrix
You did this: y=(4.536+0.107)•22 That is not the question. Only the .107 is multiplied by 22
Directrix
  • Directrix
y = 6.89 which is 6.9 to the nearest tenth.

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