1. Vacation Days A U.S. Travel Data Center survey reported that Americans stayed an average of 75 nights when they went on vacation. The sample size was 1500 find a point estimate of the population mean. Find the 95% confidence interval of the true mean. Assume the population standard deviation Was 0.8.

1. Presidential Travel In a survey of 1004 randomly selected individuals, 922 felt the president George W. Bush spent too much time away from Washington. Find a 95% confidence interval for the true population proportion.

1. Trifecta Winnings A random sample of $1 Trifecta tickets at a local racetrack paid the following amounts (in dollars and cents). Is there sufficient evidence to conclude that the auerage Trifecta winnings exceed $50 ?Use standard deviation = 0.10 Assume the variable is normally distributed.

1. Home security Sustems In 2008, 17% Of U.S. homes were protected a home security system. A random sample of 220 homes across several neighborhoods indicated that 28% were protected. At standard deviation = 0.05, is there sufficient evidence to conclude that the proportion is actually greater?

1. Hospital Volunteers At a large local hospital 20 teen volunteers worked a total of 172 hours with a standard deviation of 3.6. Thirty senior citizen volunteers worked a total of 366 hours with a stardard deviation of 4.2. At standard deviation=0.09, can a difference in means be concluded?