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The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following questions.
a) What is the likelihood the sample mean is at least $25.00?
b) What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
c) Within what limits will 90 percent of the sample means occur?
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A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
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Given 7 male individuals in a Physical Education course, the number of sit ups each individual can do in a one minute period was recorded:
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