A paint manufacturer uses a machine to fill gallon cans with paint (1 gal = 128 ounces). The manufacturer wants to estimate the mean volume of paint the machìne is putting in the cans within 0.5 ounce. Assume the population of volumes is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 0.68 ounce. (b) The sample mean is 128.5 ounces. With a sample size of 7, a 90% level of confidence, and a population standard deviation of 0.68 ounce, does it seem possible that the population mean could be exactly 128 ounces? Explain. a) The minimum sample size required to construct a 90% confidence interval is cans. (Round up to the nearest whole number.) Enter your answer in the answer box and then click Check Answer. ? 1 part remaining Clear All Check Answer

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A paint manufacturer uses a machine to fill gallon cans with paint (1 gal = 128 ounces). The manufacturer wants to estimate the mean volume of
paint the machìne is putting in the cans within 0.5 ounce. Assume the population of volumes is normally distributed.
(a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population
standard deviation is 0.68 ounce.
(b) The sample mean is 128.5 ounces. With a sample size of 7, a 90% level of confidence, and a population standard deviation of 0.68 ounce,
does it seem possible that the population mean could be exactly 128 ounces? Explain.
a) The minimum sample size required to construct a 90% confidence interval is
cans.
(Round up to the nearest whole number.)
Enter your answer in the answer box and then click Check Answer.
?
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part
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Transcribed Image Text:A paint manufacturer uses a machine to fill gallon cans with paint (1 gal = 128 ounces). The manufacturer wants to estimate the mean volume of paint the machìne is putting in the cans within 0.5 ounce. Assume the population of volumes is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 0.68 ounce. (b) The sample mean is 128.5 ounces. With a sample size of 7, a 90% level of confidence, and a population standard deviation of 0.68 ounce, does it seem possible that the population mean could be exactly 128 ounces? Explain. a) The minimum sample size required to construct a 90% confidence interval is cans. (Round up to the nearest whole number.) Enter your answer in the answer box and then click Check Answer. ? 1 part remaining Clear All Check Answer
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