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, September 1, 2000.) The decay rate (measured in ¿im/hour) for fine particles produced from oven cooking or toasting was recorded on six randomly selected days. The six measurements obtained are as follows:
DECAY
.95 | .83 | 1.20 | .89 | 1.45 | 1.12 |
Source: Abt, E., et al. “Relative contribution of outdoor and indoor particle sources to indoor concentrations.” Environmental Science &Technology, Vol. 34, No. 17, Sept. 1,2000 (Table 3).
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. What must be true about the distribution of the population of decay rates for the inference you made in part a to be valid?
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