Posted by **Carma** on Tuesday, September 11, 2007 at 4:28pm.

Two Sample Population Confidence Interval:

Before an intensive TV advertising campaign, the producers of Nike athletic

shoes find that 30 of a random sample of 217 upper-income adults were aware

of their new leisure shoe line. A second random sample of 352 such adults

is taken after the campaign. Now 122 of the persons sampled can identity the

new line. Give a 99% confidence interval for the increase in the proportion of

upper income adults showing brand awareness.

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