Statistics: Two Sample Population Confidence Inter
posted by Carma .
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 upperincome 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.

All of the confidence interval qustions can be answered by reading the Wikepieda article cited in the last question above.
Respond to this Question
Similar Questions

business statistics
A random sample of size 15 taken from a normally distributed population reveled a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal? 
Statistics
Which of the following statements correctly interprets a 95% confidence interval on a population mean? 
statistics
A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a sample … 
statistics
Use the given confidence level and sample data to find a confidence interval for the population standard sigma. Assume that a simple random sample has been selected from a population that has a normal distribution. salaries of college … 
Statistics
suppose a random sample of 360 students is drawn form a population of students. Among sampled, the average IQ score is 12 with standard deviation of 3. What is the upper confidence limit of the 95% confidence interval of the population 
Statistics
A 95% confidence interval for a population mean, ? 
Statistics
Suppose x has a moundshaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? 
Statistics 101
A researcher plans to use a random sample of n= 500 families to estimate the mean monthly family incomefor a large population. a 99% confidence interval based on the sample would be _________ than 90% confidence interval. 
Statistics (42)
A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was … 
STAT
1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of $35,000. Assume that the population standard deviation is $4,500, and that the population is normally distributed. A) Compute …