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a researcher wants to study individual household spend a sample of 40 people the mean weekly spend is 1090 with a standard deviation of 310

a researcher wants to study individual household spend

a sample of 40 people the mean weekly spend is 1090 with a standard deviation of 310 test at 1% significance level that the sample is from a population with population mean = 1100

a sample of 75 people weekly spend is 1078 with a standard deviation 270, test 5% significance level that average spend is lower than 1000

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