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A random variable x has mean -4 and E(X)^2=20. What is the standard deviation of X.
Identify sample, population, sampling frame (if applicable), and response rate (if applicable). Describe sampling technique (if applicable) or experimental design
Records indicated the restaurant gross
A randomized, controlled experiment investigated
The area under the density curve that lies between 15 and 20 is 0.414. What percentage of all possible observations of the variable are either less than 15 or greater than 20?
A company is considering expansion of its current facility to meet increasing demand. If demand is high in the future, the major expansion would result in an additional profit of $800,000, but if demand is low then there would be a loss of $500..
A major dvd rental chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is evidence that more than 5,000 of the 20,000 households in the area are equipped with dvd playe..
Jack weighs 160 pounds and his sister weighs 110 pounds. If the mean weight for men his age is 175 with a standard deviation of 14 pounds and the mean weight for women is 145 with a standard deviation of 10 pounds, determine whose weight is closer to..
A friend has offered to play a gambling game with you that involves flipping a coin that he has provided. Since a flip of heads will be to his advantage, you want to test the coin for fairness before you begin to play. Your friend is willing to..
What is the General Linear Model (GLM)? Why does it matter and compare and contrast parametric and nonparametric statistics. Why and in what types of cases would you use one over the other?
Find the mean, median, mode, variance and standard deviation for the following nine data values and find the four quartiles and the 20 th and 80 th percentiles for the above data.
A company claims the average time a customer waits on hold is less than 5 min. A sample of 35 customers has an average wait time of 4.78 min. Assume the population standard deviation for wait time is 1.8 min. Test the company claim at the α = 0.05 si..
What is chance and what role does it play in the use of inferential statistics?
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