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During the National Football League (NFL) season, Las Vegas odds makers establish a point spread on each game for betting purposes. For example, the Carolina Panthers were established as 3.5-point favorites over the eventual champion Denver Broncos in the 2016 Super Bowl. The final scores of NFL games were compared against the final point spreads established by the odds makers in Chance (Fall 1998). The difference between the game outcome and point spread (called a point-spread error) was calculated for 240 NFL games. The mean and standard deviation of the point-spread errors are 1.6 and 13.3, respectively.
Use this information to test the hypothesis that the true mean point-spread error for all NFL games is positive. Conduct the test at α = .10 and interpret the result.
the population mean annual salary for flight attendants is 56275. a random sample of 48 flight attendants is selected
The average labor charge for automobile mechanics is $54 per hour. The standard deviation is $4. Using Chebyshev's theorem, find the percentage of data values that will fall in the range of $48 to $60.
A human resource manager is interested in whether absences occur during the week with equal frequency. The manager took a random sample
If the decision to incur the high additional programming cost was to be made if p > 0.90, was the right decision made (when Eidos went ahead with the ponytail)?
A random sample of 77 eighth grade students' scores on a nation mathematics assessment test has a mean score of 278 with a standard deviation of 31.
1. You are moving to a country where malaria is endemic. From past experience you know that you don't feel well when taking anti-malarials and would like to avoid them. You want to know how much more risk you would be incurring by not using ..
Show that for any sequence of U -statistics {Un, n ≥ m} generated as above by a random variable f (X1,..., Xm ) with f symmetric and EQ | f | ∞, {Un, Cn }n≥m is a reversed martingale.
What level of confidence is associated with an interval of .400513 to .515487 for the long run proportion of new product placements?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
A representative of the Environmental Protection Agency (EPA) wants to select samples from 10 landfills. The director has 15 landfills from which she can collect samples. How many different samples are possible?
An appliance store sells 20 refrigerators each week. Ten percent of all purchasers of a refrigerator buy an extended warranty.
To find out whether the inhabitants of two South Pacific islands may be regarded as having the same racial ancestry, an anthropologist determines the cephalic indices of six adult males from each island, getting 1 = 77.4 and 2 = 72.2 and the corre..
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