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During the National Football League (NFL) season, Las Vegas oddsmakers establish a point spread on each game for betting purposes. The final scores of NFL games were compared against the final points spreads and the difference between the game outcome and point spread (called a point-spread error) was calculated for 240 NFL games and the mean and standard deviation of the differences were -1.6 and 13.3 respectively. Test to see if the true mean point- spread error differs from 0 at a 1% level of significance.
Q. What are the null and alternative hypotheses?
Q. What is the p-value for the test?
Q. What is the appropriate conclusion?
The Dept. of Labor has reported that 30% of the 2.1 million mathematical and computer scientists in the United States are women. If 3 individuals are randomly selected from this occupational group
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In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
in order to estimate the mean amount of time computer users spend on the internet each month how many computer users
Describe how you would develop a random sample from among students.
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Set up a model to test whether there are differences in mean ... DATA SET E Ages and Weights of 31 Randomly Chosen U.S. Nickels (n = 31 nickels) Nickels
A multiple choice quiz has 150 questions each with 5 choices and only 1 is the correct answer. What is the probability that sheer guess work yield from 30 to 40 correct answers out of the 150 questions?
A woman has a collection of snakes and iguanas. Her young son observed that the reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type does the woman have?
1 a set of 50 data values has a mean of 15 and a variance of 25.nbsp find the standard score of a data value
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