Chapter 2, Problem 46PS

The file Bulbs contains the life (in hours) of a sample of forty 6-wait light emitting diode (LED) light bulbs produced by Manufacture A and a sample of forty 6- wait emitting diode (LED) light bulbs produced by Manufacture B.

Use the following class interval widths for each for each distribution:

Manufacturer $\text{A:}\text{46,500}$ but less than $\text{47,500;}\text{47,500;}$ but less than $\text{46,500;}$ and so on.

Manufacturer $\text{B:}\text{47,500}$ but less than $\text{48,500;}\text{48,500}$ ; but less than $\text{49,500;}$ and so on.

a. Construct percentage histograms on separate graphs and plot the percentage polygons on one graph.

b. Plot cumulative percentage polygons on one graph.

c. which manufacturer has bulbs with a longer life-Manufacturer A or Manufacturer B? Explain.