A survey of 25- to 35-year-old Americans with professional or Ph.D. degrees was asked to report their
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A survey of 25- to 35-year-old Americans with professional or Ph.D. degrees was asked to report their monthly incomes. Can we conclude at the 10% significance level that the mean income exceeds $7,500 assuming that the incomes are normally distributed with a standard deviation of $1,200?
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