Exercise 1. Confidence Interval – The Chicago Tribune issued a report stating th

Question

Exercise 1. Confidence Interval – The Chicago Tribune issued a report stating that based on a sample of homes, the mean tax bill for Cook County is $5179 with a margin of error of $445. Express the confidence interval in the format of – E < µ < + E.

Exercise 2. Interpreting a Confidence Interval – Using the systolic blood pressure levels of the 40 women listed in Data Set 1 in appendix b, we get this 99% confidence interval: 103.5< µ < 118.1. Write a statement that correctly interprets that confidence interval.

Explanation / Answer

1)

mean = 5179 , ME = 445

CI = mean + / - ME

= 5179 + / - 445

= (4734 , 5624)

2)

Here, confidence interval for the mean of systolic blood pressure levels lies beteen 103.5 and 118.1

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