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3. A research analyst disputes the trade group's prediction that back to school spending will average $500 per family this year. She believes that average
3. A research analyst disputes the trade group's prediction that back to school spending will average $500 per family this year. She believes that average spending will differ significantly. She decides to conduct a test on a sample of 40 households with a sample mean of $522. She believes that spending is normally distributed with a population sd of $50
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