Homework Answers
The statistical software output for this problem is:
Hence,
Lower limit of confidence interval = 71.3
Upper limit of confidence interval = 76.7
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Suppose that a random sample of 20 adults has a mean score of 74 on a...
Suppose that a random sample of nineteen recently sold houses in a certain city has a...
Suppose that a random sample of nineteen recently sold houses in a certain city has a mean sales price of $290,000, with a standard deviation of $13,000. Under the assumption that house prices are normally distributed, find a 90% confidence interval for the mean sales price of all houses in this community. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number. (If necessary, consult a list...
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A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 10. The psychologist randomly selects 80 children from this group and finds that their mean IQ score is 111. Based on this sample, find a 95% confidence interval for the true mean IQ score for all children of this group. Then complete the table below. Carry your intermediate computations to...
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Suppose that a random sample of nineteen recently sold houses in a certain city has a mean sales price of $290,000, with a standard deviation of $13,000. Under the assumption that house prices are normally distributed, find a 90% confidence interval for the mean sales price of all houses in this community. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number. (If necessary, consult a list...
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