10.4 Proportions

10.4 Proportions

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: samples, what is the point estimate for the difference between the 2 population proportions (i.e., for D0)? 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 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 point estimate for the difference between the 2 population proportions (i.e., for D0)? Hypothesis Tests d = pBefore Market Research pAfter Associates is conducting 60 = 150 - 120 research to evaluate the 250 effectiveness of a client’s new = campaign. A advertising0.4 - 0.48 survey conducted = - after immediately .08 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 showe...
View Full Document

This document was uploaded on 03/05/2014.

Ask a homework question - tutors are online