Two Sample Population Confidence Interval:

Question

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.

Answer 1

All of the confidence interval qustions can be answered by reading the Wikepieda article cited in the last question above.