Question: Topaz Research is planning to sample area television viewers in

Topaz Research is planning to sample area television viewers in order to estimate the proportion of all TV sets that were tuned to Channel 4 to watch the latest NBC miniseries.
a. If the company intends to produce a 95% confidence interval that will be no wider than 4 percentage points (.04), how large a simple random sample would you recommend? (The results of a small “pilot” study showed a sample proportion of .12.)
b. How large a sample would be required for a 90% interval of the same width?
c. Suppose no pilot study results were available. Recompute the recommended sample sizes for parts a and b.

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  • CreatedJuly 16, 2015
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