Question
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.
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.
Answers
DrBob222
All of the confidence interval qustions can be answered by reading the Wikepieda article cited in the last question above.