an economics professor randomly selected 200 U.S. millionaires. the average age of these millionaires was 52 years old with a...
spiitc1an economics professor randomly selected 200 U.S. millionaires. the average age of these millionaires was 52 years old with a standard deviation of 12 years. what is a 99% confidence interval for the mean age of all U.S. millionaires?
13 years ago
999999.99
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