Question

Somebody help please, one quick problem (25 points): For making a scatter plot of the data set, which would be the best scale and interval for the axis that represents the amount of fluoride? water (L) 1 0.5 0.8 2 1.5 0.5 2.5 Fluoride (mg) 0.4 0.4 0.6 1.6 0.8 0.2 1.8

Answer 1

Fluoride ranges from 0.2 to 1.8. I'd use a scale from 0 to 2 with an interval of 0.2, since that seems to be the resolution of the data. That puts 10 intervals in the range, which is about the right amount. (You generally want between 5 and 20.)

Water ranges from 0.5 to 2.5, so I might use a scale from 0 to 3 with major intervals marked at 0.5 and minor intervals at 0.1. You'd like to have all data points be on grid lines, but with one at 0.8 and several at multiples of 0.5, some compromise is needed.

Answer 2

0 to 2 with interval of 0.2

Explanation:

We are given:

Water (L) = 1, 0.5, 0.8, 2, 1.5, 0.5, 2.5

Fluoride (mg)= 0.4, 0.4, 0.6, 1.6, 0.8, 0.2, 1.8

Looking at the values given for Flouride (mg), we have the lowest value of 0.2 and the highest value of 1.8

Therefore, the axis should start at 0 and the highest it should go up to is 2

To find which would be the best scale and interval for the axis that represents the amount of fluoride, we compare the values in between 0.2 and 1.8, we have 0.4, 0.4, 0.6, 0.8 and 1.6.

We need a scale range for easier reading of values. For accuracy, we need the values to be as small as possible, now we have:

A scale of 0 to 2 with interval of 0.2