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Finding 98% and 99% Confidence Intervals

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1. What is the 99% confidence interval for the variance of exam scores for 25 algebra students, if the standard deviation of their last exam was 10.7?

2. In a sample of 60 mice, a biologist found that 42% were able to run a maze in 30 seconds or less. find the 98% limit for the population proportion of mice who can run that maze in 30 seconds or less.

3. What is the 99% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 28 babies born there was 1.3 pounds?

Solution Summary

The solution gives detailed steps on finding 98% and 99% confidence intervals for the population variance and population proportion respectively.

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1. At 99% level, the critical value is 9.886 and 45.559 from chi square table.
So lower limit=(25-1)*10.72/45.559=60.31 and ...

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