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An investor puts 45.00% of his investment into Gisco Systems, and the remaining 55.00% into Apple Computer: The standard deviation on Giaco Systems stock is 34.00%, while the standard deviation on Apple Computer is 27.00%. Find the standard deviation of this portfolio if the correlation between the two stocks is 0.65.
If there were 18 million users of handheld data devices of this kind on that day, what is the probability that a randomly chosen user could not use a device?
So the total length of the assembly is roughly Normal. What is the natural tolerance for the total length? It is not d1 + 2d2, because standard deviations don't add.
how does variablity in a population influence standard error of the mean? if you were studying the effect of puppies on
If you sample 100 oranges and find that sample mean weight to be 3.7 oz, would you doubt the statement that the orange comes from the population with mean weight of 4.0 oz and standard deviation of 1.0 oz? Justify your answer.
If a random sample of 225 pecan trees is selected, what is the standard deviation of the sample mean?
a suppose you roll a special 28-sided die. what is the probability that the number rolled is a 1 or a 2?b suppose that
Why is the Central Limit Theorem used?
in a poll of n 200 randomly selected individuals 60 people said they are opposed to the death penalty for persons
State the Null Hypothesis and the Alternative Hypothesis
What conclusions can you reach about the relationship between sales and hours of training? What sorts of business implications does this have?
What is the probability that the needle crosses a line? You can find both a solution by mathematics and a simulation at George Reese's site.
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
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