Question: State the null hypothesis Ho and the alternative hypothesis Ha that would be used for a hypothesis test related to each of the following statements:

1. The mean age of the students enrolled in evening classes at a certain college is greater than 26 years.
2. The mean weight of packages shipped on Air Express during the past month was less than 36.7 lb.
3. The mean life of fluorescent light bulbs is at least 1600 hours.
4. The mean strength of welds by a new process is different from 570 lb per unit area, the mean strength of welds by the old process.

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