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Each member of a random sample of 15 business economists was asked to predict the rate of inflation for the coming year. Assume that predictions for the whole population of business economists follow a normal distribution with standard deviation 1.8%.
a. The probability is 0.01 that the sample standard deviation is bigger than what number?
b. The probability is 0.025 that the sample standard deviation is smaller than what number?
c. Find a pair of numbers (say a and b) such that the probability that the sample standard deviation lies between these two numbers is 0.90.
Find out about your company's forecasting system
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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?
Plain old Monty Hall
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Suppose that scores on the Math SAT exam follow a Normal distribution with mean 500 and standard deviation 100. Two students that have taken the exam are selected at random. What is the probability that the sum of their scores exceeds 1200?
Define a correlation coefficient
1. a university has been tracking the percentage of alumni giving to its annual fund each for the past 10 years. the
What values can X take on? What values can Y take on?
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