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A 95% confidence interval for the population proportion of professional tennis players who earn more than 2 million dollars a year is found to be between .82 and .88. Given this information, the sample size that was used was approximately?
Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy and storage. Let x be a random variable that represents the number of milligrams of porphyrin per deciliter of blood.
Consider the following two economic characteristics with two possible outcomes each: employment (increase, decrease) and economic trend (positive, negative).
Analyst computes production cost per unit in each order and averages these to get $50.
Tthe sample standard deviation is 11 months. We will be using a z-test for the population mean at α = 0.05 to check the manufacturer's claim.
Choose an American driver at random and let the random variable X be the number of speeding tickets the driver has received in the last two years. The discrete probability distribution of X is shown.
Determine the mode for this distribution. Describe why you can't calculate the mean number of times using data in the table.
Determine the minimum sample size to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.2 years.
Based upon all of this information, do a "goodness-of-fit" test to see if the distributions are the same as they were two years ago. Use a level of confidence of .01. Should we accept Ho or reject Ho?
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
Score for the states eith graders on the examination is more than 260. At alpha equals 0.04 is there enough evidence to support the clim?
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution:
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