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13. Set up Ho and H. (a) In the past, your average income was $5000 per year. An administrator believes the average income has increased.

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13. Set up Ho and H. (a) In the past, your average income was $5000 per year. An administrator believes the average income has increased. (b) The percentage of passing a Math course was 70%. The Dean believes there is a decrease in the passing rate

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