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A researcher wants to know what percentage of students at two different universities study for more...

A researcher wants to know what percentage of students at two different universities study for more than one hour per night. He takes a simple random sample of 100 students from each school and finds that 40% of students at school 1 study for more than one hour per night and 35% of students at school 2 study for more than one hour per night.

Construct a 95% confidence interval for the difference between the proportion of students who study for more than one hour per night at these two universities

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