The following data represent the pH of rain for a random sample of 12 rain dates in a particular region. A normal
probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates
there are no outliers. The sample standard deviation is s = 0.347. Construct and interpret a 90% confidence
interval for the standard deviation pH of rainwater in this region.
4.48 5.24 5.00 4.71 4.71 4.84
5.69 4.67 5.07 4.78 4.65 4.47
Click the icon to view the table of critical values of the chi-square distribution.
Select the correct choice below and fill in the answer boxes to complete your choice.
(Use ascending order. Round to three decimal places as needed.)
A. There is 90% confidence that the population standard deviation is between___
and___
B. If repeated samples are taken, 90% of them will have the sample standard deviation between_
and_
C. There is a 90% probability that the true population standard deviation is between_
and_