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A promotion campaign is being planned to encourage people to reduce heat in their houses at night. In order to measure the campaign's impact, we want to determine the proportion of people who reduce their heat at night. A telephone sample will be taken before and after the campaign.
a. What sample size is required if an accuracy of 0.02 is desired at a 95 percent confidence level?
b. What sample size is required if an accuracy of 0.04 is desired at a 95 percent confidence level?
c. Calculate new sample sizes for part (a) and (b) if you know that the proportion of people who reduce their heat at night would not exceed 0.3.
d. Assume that a before measure was taken with a sample size of 400 and the sample proportion was 0.3. Generate a 90 percent confidence level estimate for the population proportion.
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
Healthcare issues are receiving much attention in both academic and political arenas. Compute the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year.
A regional manager visits local fast-food franchises and evaluates the speed of the service. If the manager receives her meal within 45 seconds, the server is given a free movie-admission coupon.
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
The sample mean of the accounts is found to be y-bar = $94.22, and the sample variance is equal to $455.21. Estimate mu and place a bound on the error of estimation.
Determine the relationships among data above? Analyze with charts/graphs/tables and a discussion.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Draw a ball from number 1: if red go to number 2; if black go to number 3. What is probability
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
A sample of 10 urgent and non-urgent patients was conducted to determine average wait time. The hospital wants to be sure that urgent patients do not wait as long as non-urgent patients. The following hypotheses have been formulated.
Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent.
You may assume the sample data comes from a population that follows a normal distribution.
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