557 market area showed 60 households pz zstat 00597

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

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: of households aware Example Do the data indicate a difference in the proportion of households aware of the product after the advertising campaign? Hypothesis Tests Market Research Associates Difference Between 2 Population Proportions is conducting research to evaluate the effectiveness of a p −p 1 2 zSTAT = Hypotheses: client’s new advertising test 1 1 H0: pBefore – pAfter ≥ 0 statistic campaign. A survey conducted p( − p) + 1 n n2 1 immediately pBefore – pAfter < 0 Ha: after the new H0: p1 – p2 ≤ 0 campaign showed 120 out of Ha: p1 – p2 > 0 250Decision “aware”(of the value): upper households Rule critical tail test reject H0 if zSTAT > zα client’s product. Reject H0 if zSTAT < zα Before the new campaign H0: p1 – p2 ≥ 0 began, a telephone survey of lower tail Ha: p1 – p2 < 0 150Statistical Decision: households in the test test reject H0 if zSTAT ≤ –zα zSTAT = –1.557 market area showed 60 householdszα = z.05 = –1.645 “aware” of the H0: p1 – p2 = 0 twocli...
View Full Document

Ask a homework question - tutors are online