# Statistics - Population Variance - Confidence Interval

The grades of a sample of 5 students, selected from a large population, are given below.

Grade

70

80

60

90

75

a. Determine a point estimate for the variance of the population.

b. Determine a 95% confidence interval for the variance of the population.

c. At 90% confidence, test to determine if the variance of the population is significantly more than 50.

https://brainmass.com/statistics/confidence-interval/statistics-population-variance-confidence-interval-209967

#### Solution Summary

The expert examines the confidence intervals for a population variance. A complete, neat and step-by-step solution is provided in the attached file.

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