Oven cooking study. A group of Harvard University School of Public Health researchers studied the impact of cooking on the size of indoor air particles (Environmental Science

& Technology, Sept. 1, 2000). The decay rate (measured in mm>hour) for fine particles produced from oven cooking or toasting was recorded on six randomly selected days.

The data is provided in the table.

a. Find and interpret a 95% confidence interval for the true average decay rate of fine particles produced from oven cooking or toasting.

b. Explain what the phrase “95% confident” implies in the interpretation of part a.
*c. Estimate the true standard deviation of decay rate with a 95% confidence interval. Interpret the result.

d. What must be true about the distribution of the population of decay rates for the inferences you made in parts a and c to be valid?

e. Suppose that we want to estimate the average decay rate of fine particles produced from oven cooking or toasting to within .04 with 95% confidence. How large a sample should be selected?

Transcribed Image Text:

.95 .83 1.20 .89 1.45 1.12