10.4 Proportions

# Reject h0 campaign before the new if pz zstat of

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Unformatted text preview: ent’s product. Ha: Therefore, zSTAT.05 zα and tailed reject Hp1if–zp2 ≠ 0≤ – &gt; Can we conclude using a 0 STAT test zα/2 or if zSTAT &gt; zα/2 H0 is that rejected. level of significance not the proportion 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 &lt; 0 Ha: after the new H0: p1 – p2 ≤ 0 campaign showed 120 out of upper Ha: p1 – p2 &gt; 0 250Decision “aware” (of the approach): households Rule p-value tail test reject H0 if zSTAT &gt; zα client’s product. Reject H0 campaign Before the new if P(z &lt; zSTAT)&lt; α H0: p1 – p2 ≥ 0...
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