Question

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?


1 to 4 with intervals of 1


2 to 5 with intervals of 0.5


0 to 4 with intervals of 2


0 to 4 with intervals of 0.2

Which statement is true?

This scatter plot has two clusters and one outlier.


This scatter plot has no clusters and one outlier.


This scatter plot has one cluster and no outliers.


This scatter plot has no clusters and no outliers.

Answer 1

I'd say the answer to the first question is D) 0 to 4 with intervals of 0.2.

Because, you can't just have 1 to 4, as some of the numbers are less than 1.  Of course you can't have 2 to 5 either. And intervals of 2 would be too messy.

For the second question:

I believe the answer is A. Because it's obvious that there IS one outlier, and it looks like there are two clusters.

So, the answers are: A) and D).