Automobile manufacturers. Consumer Reports uses surveys given to subscribers of its magazine and website (www.ConsumerReports.org) to measure reliability in automobiles. This annual survey asks about problems that consumers have had with their cars, vans, SUVs, or trucks during the previous 12 months. Each analysis is based on the number of problems per 100 vehicles.

a) State your hypotheses.

b) State and check the conditions.

c) How many degrees of freedom are there?

d) The calculation yields x2 = 2.928, with P = 0.231.
State your conclusion.

e) Would you expect that a larger sample might find statistical significance? Explain.

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Origin of Manufacturer Asia Europe U.S. Total No Problems 88 79 83 250 Problems 12 21 17 50 Total 100 100 100 300 Expected Values Asia Europe U.S. No Problems 83.33 83.33 83.33 Problems 16.67 16.67 16.67