Suppose 10 Texas counties are randomly selected to study the average percent of residents who are wearing a mask. The percentages for these 10 counties are  20 30 48 18 45 51 12 62 35 25 Assuming that the population standard deviation, sigma, is 12, calculate a 95% confidence interval estimate of the mean percent of residents wearing a mask in Texas.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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Suppose 10 Texas counties are randomly selected to study the average percent of residents who are wearing a mask. The percentages for these 10 counties are 

20 30 48 18 45 51 12 62 35 25

Assuming that the population standard deviation, sigma, is 12, calculate a 95% confidence interval estimate of the mean percent of residents wearing a mask in Texas.

1. 27% - 42%

2. 23% - 46%

3. 24% - 45%

4. 26% - 43%

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