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Question - George Fastrack, head of the Bureau of Obfuscation's United Way drive, wants to know the average United Way pledge among Obfuscation Bureau employees (pledges are normally distributed). George takes a sample of 10 and gets the results shown in the accompanying table. What is George's best estimate of the mean donation? What is George's best estimate of the standard deviation of the donations? Between what two values can George be 95% sure the mean value lies?
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
tri-county utilities inc. supplies natural gas to customers in a three-county area. the company purchases natural gas
He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
comparing averages. suppose the national basketball association nba reports that the average height of basketball
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
What are the five steps for calculating probabilities of events? Please apply these steps to an example.
Create a sample frequency distribution for one of the variables. Choose either a simple or grouped frequency distribution and explain your choice.
Two cards are drawn without replacement from a pack X measures hearts drawn and Y measures clubs drawn, both are random variables.
Suppose a study is conducted to test the claim, at a 0.01 significance level, that less than 75% of college students spend less than $250 per semester on text books. A survey of 700 students found that 71% spent less than $250 per semester on text..
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10.
a new car that is a gas- and electric-powered hybrid has recently hit the market. the distance travelled on 1 gallon of
suppose we have a population of scores with a mean micro of 975 and a standard deviation s of 15. assume that the
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