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?

Answer 1

The best scale and interval to adopt for the amount of Fluoride axis would be 0 to 8 with intervals of 0.2

To make a decision on the scale and interval to adopt when making a graph ;

• We need to examine the the range of the values in the distribution.

• Data for the amount of Fluoride ranges from 0.4 to 7.1

• The number of values in the distribution is 7.

• Lower scale value must be below the minimum Fluoride value preferably 0

• Maximum scale value must be above the maximum Fluoride value.

• Hence an interval of 0 to 8 would suit the axis.

• The interval is the value of each unit represented on the graph.

• A scale of 4 would be too large to depict all the 7 values with an interval of 8 units

• Hence, the most reasonable scale from the option would be 0.2 as it would allow the points to be properly spaced on the graph.

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