1. A researcher wished to test the claim that the rate ofdefectives among the co

Question

1. A researcher wished to test the claim that the rate ofdefectives among the computer of two different manufacturers is thesame. She selected two independent random samples and found that1.3% of 212 computers from manufacturer A were defective and 2.8%of 105 computers from manufacturer B were defective.

2. An Illinois study examined the effect of day care on behaviorin toddlers. Randomly selected parents who had a toddler infull-time day care were asked if their child had behavioralproblems. The researchers found that among 726 parents surveyed,169 said their child had behavioral problems. Among 314 randomlyselected parents with a toddler at home (not in day care), 15reported that their child had behavioral problems.

Which of these answers would be correct for the two?

Explanation / Answer

1) E) The success/failure condition is not satisfied, becuase thenp^=3. Here np^ is not greater than 10. 2) A) The assumptions and conditions are satisfied, sincenp^>=10.

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