10.4 Proportions

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Unformatted text preview: d 60 households “aware” of the client’s product. Difference Between 2 Population Proportions parameter D = p1 – p2 point estimator d p− 2 =1 p p( −p) p ( −p ) standard 11 1 21 2 σ= + error d n n 1 2 p( −p) p ( −p ) margin of 11 1 21 2 z2 + error α n n 1 2 p( −p) p( −p) interval 11 1 21 2 d±z 2 + α estimate n n 1 2 Example Given these samples, what is the interval estimate for the difference in awareness of the product? Hypothesis Tests Market Research Associates is conducting research to evaluate the effectiveness of a client’s new advertising campaign. A survey conducted immediately after the new campaign showed 120 out of 250 households “aware” of the client’s product. Before the new campaign began, a telephone survey of 150 households in the test market area showed 60 households “aware” of the client’s product. Difference Between 2 Population Proportions parameter D = p1 – p2 point estimator d = pAfter - pBefore = 0.08 p( −p) p ( −p ) standard 11 1 21 2 σ= + error d n n 1 2 p( −p) p ( −p ) margin of 11 1 21 2 z2...
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## This document was uploaded on 03/05/2014.

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