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1. Internet music. In a survey on downloading music, the Gallup Poll asked 703 Internet users if they "ever down- loaded music from an Internet site that was not authorized by a record company, or not," and 18% responded "yes." Construct a 95% confidence interval for the true propor- tion of Internet users who have downloaded music from an Internet site that was not authorized.
2. Economy worries. In 2008, a Gallup Poll asked 2335 U.S. adults, aged 18 or over, how they rated economic condi- tions. In a poll conducted from January 27-February 1, 2008, only 24% rated the economy as Excellent/Good. Construct a 95% confidence interval for the true propor- tion of Americans who rated the U.S. economy as Excellent/Good.
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table.
suppose xn01and y n22that is ey 2 and vary2 and x and y are independently distributed. you are required to use the
A player throws a fair coin and wins $1 each time it's heads, but loses $1 each time it's tails. The player will stop when his or her net winnings reach $1, or after n throws, whichever comes sooner. What is the player's probability of winning, an..
Construct a scatter plot for the data and do the data appear to have a positive linear correlation, a negative linear correlation, or no linear correlation?
in a group of 13 people the mean age is 25 years. a person who is 36 years leaves the group. what is the new mean of
The following survey questions have been established for a medical errors and patient safety business research paper:
A video movie store owner finds that 30% of the customers entering the store ask an assistant for help and that 20% of the customers make a purchase before leaving. It is also found that 15% of all customers both ask for assistance and make a purc..
At a =.02 , is the number of sticks of gum a person chews per day actually greater than 8? Use the traditional method of hypothesis testing.
when a survey calls residential telephone numbers at random only 24 of the calls reach a live person. you watch the
The profit from each type of dealership, given the availability of gas is shown in the following payoff tableCompact Cars $300000 $150000. Construct a decision tree for the situation described above and indicate the best decision.
records pertaining to the hourly brown trout catch have been obtained in order to include this parameter into a
an airport official wants to prove that the proportion of delayed flights for airline a denoted as p1 is less than the
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