Question

. Starting salaries of college graduate this year follow a normal distribution.

1) What is the sampling distribution of sample variance s^2?


2) Derive 90% confidence interval formula for the population variance σ^2 using the sampling distribution of sample variance s^2.


3) A survey for starting salary of 25 college graduates was conducted and the sample variance is 100^2. Find the 90% confidence interval of the population variance σ^2.

Answer 1

Answer:

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