Hyram Drant, a research analyst for the city fire department, suspects that old

Question

Hyram Drant, a research analyst for the city fire department, suspects that old water pumps are more likely to fail. From the data in the accompanying table, construct a contingency table and check Drant’s suspicion. How else could this problem be analyzed? (Hint: The sub-categories of “age of pump” can be “less than 30 years” and “30 years over”; the sub-categories of “pump performance” can be “pump failed” and “pump did not failed” as indicated by the problem. Organize the data and build a contingency table according to these subcategories and then analyze.)

Age of pump in years Pump Failed Pump Did not Fail Pump Did not Fail 23 15 7 47 6 9 11 9 4 53 33 19 26 26 36 15 17 47 42 9 31 37 12 23 31 6 46 9 15 3

Explanation / Answer

Hyram Drant, a research analyst for the city fire department, suspects that old

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