Some Problems for W5The following problems are to be written up in polished form

Some Problems for W5The following problems are to be written up in polished form showing all relevant work1. A researcher is interested in estimating the proportion of voters who favor a tax on e-commerce. In a sample of 250 people she finds that 36 favor such a tax. a. Find a 95% confidence interval for the true population proportion of voters who favor such a tax. b. Find a 99% confidence interval for the true population proportion of voters who favor such a tax. 2.
Some Problems for W5The following problems are to be written up in polished form showing all relevant work1. A researcher is interested in estimating the proportion of voters who favor a tax on e-commerce. In a sample of 250 people she finds that 36 favor such a tax. a. Find a 95% confidence interval for the true population proportion of voters who favor such a tax. b. Find a 99% confidence interval for the true population proportion of voters who favor such a tax. 2. As part of an advertising campaign the Dairy Council is interested in determining the daily intake of milk among adults. A random sample of 10 adults gave the following results. (Values are given in ounces.)23.0 30.6 20.3 10.1 11.5
21.8 22.2 26.9 21.0 30.1a. Find x-bar and s for this data set. b. Construct a 99 percent confidence interval for the mean daily intake of milk. You may assume the daily intake amounts are normally distributed. (Note: These results could then be used in later studies to see if the ad campaign is succeeding in increasing the amount of milk adults drink.) 3. A sociologist develops a test to measure attitudes about public transportation and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 90% confidence interval for the mean score of all such subjects. You may assume the scores are normally distributed. 4. To estimate the true mean weight of packages received by a parcel service 39 packages are randomly selected and weighed. The sample has a mean weight of 15.3 pounds and a standard deviation of 1.9 pounds. Create a 95% confidence interval estimate for the true mean weight of all packages received by the parcel service. 5. A 99% confidence interval (in inches) for the mean height of a population is 65.44

Attachments: