Find a 95 confidence interval for the population variance, Basic Statistics

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Find a 95 confidence interval for the population variance

Business and Management

A personnel manager at Inserra Supermarkets is concerned about the pattern of overtime hours claimed by employees. Although there is a special budget to pay for overtime hours, large fluctuations may cause cashflow problems. In a random sample of 25 employees, the sample variance for the number of overtime hours claimed was 4.25. Assume the distribution of overtime hours is normal.

a. Find a 95% confidence interval for the population variance of overtime hours.

b. Find a 95% confidence interval for the population standard deviation of overtime hours.

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Basic Statistics: Find a 95 confidence interval for the population variance

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Basic Statistics: Find a 95 confidence interval for the population variance

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