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Estimate the current proportion of individuals without health care insurance with a margin of error of .03? Use a 95% confidence level.
For many years businesses have struggled with the rising cost of health care. But recently, the increases have slowed due to less inflation in health care.
America's young people are heavy Internet users: 87% of Americans ages 12 to 17 are Internet users.
Develop a 95% confidence interval for the proportion of wealthy people who lost 25% or more of their portfolio value over the past three years.
A sample survey of 54 discount brokers showed that the mean price chard for a trade of 100 shares at $50 per share was 533.77
A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation.
If the amount spent on restaurants and carryout food is skewed to the right, would you expect the median amount spent to be greater or less than $1873?
US Airways conducted a number of studies that indicated a substantial savings could be obtained by encouraging Dividend Miles.
A recent article reported that there are approximately 11 minutes of actual playing time in a typical National Football League (NFL).
Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile per gallon.
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient.
Annual salary plus bonus data for chief executive officers are presented in the BusinessWeek Annual Pay Survey.
What is the point estimate of the proportion of the population of working parents who feel they spend too little time with their children because of work.
Assume the population standard deviation is $7400. Suppose that a random sample of 60 USC students will be taken from this population.
Three firms carry inventories that differ in size. Firm A's inventory contains 2000 items, firm B's inventory contains 5000 items.
A researcher reports survey results by stating that the standard error of the mean is 20. The population standard deviation is 500.
A market research firm conducts telephone surveys with a 40% historical response rate.
Advertisers contract with Internet service providers and search engines to place ads on websites.
A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is s = 15.
In an effort to estimate the mean amount spent per customer for dinner at an Atlanta restaurant, data were collected for a sample of 49 customers.
The National Quality Research Center at the University of Michigan provides a quarterly measure of consumer opinions about products and services.
AARP reported on a study conducted to team how long it takes in individual to prepare their federal income tax return(AARP Bulletin. April 2008).
Assume this estimate of the mean annual household income is based on a sample of 80 households.
Use these values as the population means for men and women and assume that the population standard deviation s = 14 strokes for both.
What is the probability that a simple random sample ofautomobile insurance policies will have a sample mean within $25 of the population mean.