24. Correlation -0.015

Question

How confident can you be?

I'm confident in -0.015 because it's closer to 0 than anything else, therefore has no correlation.

25. 25. 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. He sets up the following and records the data.

Every day for a week: counts how many times each player leg press 350 lbs

following week: 40 yd sprint each day

Table shows average number of leg-press & yard dash time for 7 players

What is the equation of best fit?
How many seconds should be expect a player to take to run 40 yards if that player can do 22 leg-press repetitions? Round any values to the nearest tenth, if necessary.

Leg Press (reps) 15 - 18 - 8 - 30 - 26 - 12 - 21
40-yard Dash (s) 5.2 - 6.3 - 6.8 - 8.2 - 8.0 - 5.3 - 5.9

I'm not sure how to calculate the 40 yard dash

Answer 1

In problems of this type, it is easier if you could make a scatter plot (or dot-plot) of the data before starting the calculations.

In case you spot an outlier, you will have to occasion of excluding it before you do the calculations.

In the given data, I suspect there is an outlier, but if you have not learned about the criteria of eliminating an outlier before, you can just ignore it.

Do you have a graphing calculator?
If you're expected to find the regression line (equation of best fit) with it, then try the calculator. If you don't know how to operate it, post the make and model of the calculator. Perhaps someone can help.

If you have learned to find the equation of best by graphing, then graph it first, and then draw a line as close to most points as possible and determine the equation.

Answer 2

Don’t bother translating what he said, it was about some brand copying thingy. I just wasted a minute of my life