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I had (0.0805, 0.2695). It should be rounding errors. BTW they are asking for CI for the increase so it's positive.
Did I do this correct?
Before an intensive TV advertising campaign, the producers of Nike athletic shoes find that 29 of a random sample of 200 upper-income adults were aware of their new leisure shoe line. A second random sample of 300 such adults is taken after the campaign. Now 96 of the persons sampled can identify the new line. Give a 99% confidence interval for the increase in the proportion of upper-income adults showing brand awareness.
Here's what I came up with -.27 to -.07 ?
I had (0.0805, 0.2695). It should be rounding errors. BTW they are asking for CI for the increase so it's positive.
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