The Edmunds. com NHTSA Complaints Activity Report contains consumer vehicle complaint submissions by automaker, brand, and category (data extracted from edmu. in/ Ybmpuz.) The following tables, stored in Automaker1 and Automaker2 , represent complaints received by automaker and complaints received by category for January 2013.
Automaker Number
American Honda......... 169
Chrysler LLC......... 439
Ford Motor Company..... 440
General Motors......... 551
Nissan Motors Corporation... 467
Toyota Motor Sales...... 332
Other............. 516
a. Construct a bar chart and a pie chart for the complaints received by automaker.
b. Which graphical method do you think is best for portraying these data?
Category Number
Airbags and seatbelts........ 201
Body and glass........ ... 182
Brakes........ ...... 63
Fuel/ emission/ exhaust system.... 240
Interior electronics/ hardware.... 279
Powertrain........ .... 1,148
Steering........ ...... 397
Tires and wheels............ 71
c. Construct a Pareto chart for the categories of complaints. 

d. Discuss the “ vital few” and “ trivial many” reasons for the categories of complaints.