Question

a study was conducted to determine how people get jobs. the table below lists data from 400 randomly - selected subjects.
job sources\tfrequency
help - wanted ads (h)\t38
executive search firms (e)\t71
networking (n)\t16
mass mailing (m)\t203
choose the correct pie chart
compare the pie chart found above to the pareto chart given on the left. can you determine which graph is more effective in showing the relative importance of job sources?
a. neither one is effective
b. the pie chart is more effective
c. the pareto chart is more effective

Explanation:

Step1: Analyze frequencies

We have frequencies for different job - sources: Help - wanted ads ($H$) = 38, Executive search firms ($E$) = 71, Networking ($N$) = 16, Mass mailing ($M$) = 203. The total number of subjects is $38 + 71+16 + 203=400$.

Step2: Determine relative sizes in pie - chart

The largest frequency is for mass mailing ($M$), so the largest slice in the pie - chart should be for mass mailing. Among the given pie - charts, the one with the largest yellow slice (corresponding to mass mailing) is the correct one.

Step3: Compare with Pareto chart

A Pareto chart arranges data in descending order of frequency and also shows cumulative frequencies. It is better for showing relative importance as it clearly ranks the categories from most to least important. A pie - chart just shows the proportion of each category in the whole, but not the ranking as clearly as a Pareto chart.

Answer:

The correct pie - chart is the one with the largest yellow slice (for mass mailing). The answer to the comparison question is C. The Pareto chart is more effective.