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Give a 95 percent confidence interval for the percentage

In a random sample of 63 students in 2000, 3 got first class honours. A random sample of 42 is conducted in 2009 and 7 got firsts.

Give a 95 percent confidence interval for the percentage who got firsts in 2000.
Can you conclude that the percentage of students getting firsts has risen? Specifically i. What is the null hypothesis?

Please explain what formulas are being used.

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Business Management: Give a 95 percent confidence interval for the percentage

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