Efore pafter zstat z and tailed 1557 ha p1 p2 0

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: gt; zα Reject = 0 if zSTAT z pH Before the new campaign = > n α + n n1 + n 2 After Before H0: p1 – p2 ≥ 0 began, a telephone survey of lower tail Ha: p1 – p2 < 0 150Statistical Decision: .4 = 0.45 households in 250×.48 + 150× the test = test reject H0 if zSTAT ≤ –zα zSTAT250 1150 = + .557 m2. arket area showed 60 calculate zSTAT: households zα = z.05 = 1.645 “aware” of the H0: p1 – p2 = 0 twoclient’s product. Ha: Therefore, zSTAT.05 zα and tailed reject Hp1if–zp2 ≠ 0≤ – < Can we conclude using a 0 STAT test zα/2 or if zSTAT > 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 < 0 the new Ha: after STAT test...
View Full Document

Ask a homework question - tutors are online