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Market researchers want to estimate the mean monthly expenditure on transport for households in Sydney. The researchers want to calculate the 95% confidence interval of

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Market researchers want to estimate the mean monthly expenditure on transport for households in Sydney. The researchers want to calculate the 95% confidence interval of the mean. They randomly selected 40 householders and asked their expenditure on transport over the past month. The sample mean is $350. The population standard deviation is known to be $200

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