Question: I NEED TO KNOW HOW TO GET THIS ANSWERS USING TI-84 PLUS CALCULATOR. 1)Use the given degree of confidence and sample data to find a

I NEED TO KNOW HOW TO GET THIS ANSWERS USING TI-84 PLUS CALCULATOR.

1)Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation.Assume that the population has a normal distribution. Round the confidence interval limits to the same number of decimal places as the sample standard deviation .

The mean replacement time for a random sample of 20 washing machines is 9.4 years and

the standard deviation is 2.6 years. Construct a 99% confidence interval for the standard

deviation, , of the replacement times of all washing machines of this type.

ANSWER: 1.8 yr < < 4.3 yr

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