Chapter 1.1, Problem 18E

(a)

To determine

To describe: how the given graph is misleading

Answer to Problem 18E

The bars should start at 0.

Explanation of Solution

Given:

  

Calculation:

The bar graph depicting the evidence that eating oatmeal does reduces cholesterol is misleading because the y-axis (vertical scale) is starting from 196 rather than from 0. This causes the difference between the weeks to be exaggerated.

Conclusion:

Therefore, thebars should start at 0.

(b)

To determine

To make: a new graph which does not misleads and conclude about the effect of eating oatmeal on cholesterol reduction.

Answer to Problem 18E

Here, is the graph which does not misleads

  

Explanation of Solution

Calculation:

Can make a new graph that is not misleading (vertical scale starting from 0) by taking approximate data from the given bar graph.

Sl. No.	Week No.	Cholesterol
1	Week 1	209
2	Week 2	205
3	Week 3	201
4	Week 4	199

The bar graph for cholesterol point is given below.

  

Looking at the graph it seems that there is not much difference is cholesterol level on weekly basis. The previous graph was misleading due to distortion done is scale put misleading picture that intake of oatmeal reduces cholesterol level.

Conclusion:

Therefore, the above graph isn’t misleadingand the cholesterol deceases slightly over the 4 weeks.