Exhibit 10

question 69

Multiple Choice

Exhibit 10.12.A veterinarian wants to know if pit bulls or golden retrievers have a higher incidence of tooth decay at the age of three.The vet surveys 120 three-year old pit bulls and finds 30 of them have tooth decay.The vet then surveys 160 three-year old golden retrievers and finds 32 of them have tooth decay.Number the population of pit bulls and golden retrievers by 1 and 2,respectively. Refer to Exhibit 10.12.At the 10% significance level,can the vet conclude the proportion of pit bulls that have tooth decay is different than the proportion of golden retrievers that have tooth decay?

• A)No,because the confidence interval contains zero.
• B)Yes,because the confidence interval contains zero.
• C)No,because the confidence interval does not contain zero.
• D)Yes,because the confidence interval does not contain zero.

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