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According to the U.S. Energy Information Adminis-tration, regular gasoline averaged $2.65 per gallon in the United States in April 2018. Assume the standard deviation for gasoline prices is $0.12 per gallon. A random sample of 30 service stations was selected.
a. What is the probability that the sample mean will be less than $2.66?
b. What is the probability that the sample mean will be more than $2.63?
c. What is the probability that the sample mean will be between $2.62 and $2.72?
d. Suppose the sample mean is $2.71. Does this result support the findings of the U.S. Energy Informa-tion Administration? Explain your answer
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The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
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The fat percentages found were as follows: 24, 40, 29, 32, 33, 25, 15, 22, 18, 25, 16, 27. On the basis of these data, can we conclude that middle-age men employed by the corporation have become fatter? Assume a directional H1 is legitimate and us..
In order to compare the mean hemoglobin (Hb) levels of well-nourished and undernourished groups of children, random samples from each of these groups yielded the following summary.
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One of the retail industry s biggest frustrations is customers who abuse the return and exchange policies.
a) Identify the observational units. b) Use a calculator to determine the exact binomial one-sided p-value.
What is the optimal number of strings and guitar picks for Slash to purchase? How much utility does this combination give him?
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