The environmental Protection Agency releases figures on urban air soot in selected cities in the United States. For the city of St. Louis, the EPA claims that the average number of micrograms of...

1. What is the appropriate null hypothesis?
2. What is the appropriate alternative hypothesis?
3. The decision rule is _____?
4. The average air soot level is __?
5. The variance of the air soot level is _____?
6. The value of the test statistics_______?
7. The critical value is ______?
8. The p-value is ___?
9. The appropriate decision is to reject Null Hypothesis or fail to reject Null Hypothesis ______?

Extracted text: The environmental Protection Agency releases figures on urban air soot in selected cities in the United States. For the city of St. Louis, the EPA claims that the average number of micrograms of suspended particles per cubic meter of air is 82. Suppose St. Louis officials have been working with businesses, commuters, and industries to reduce this figure. These city officials hire an environmental company to take random measures of air soot over a period of several weeks. The resulting data follow. Use these data to determine whether the urban air soot in St. Louis is significantly lower than it was when the EPA conducted its measurements. Let a=.05. Let u = average number of micrograms of suspended particles per cubic meter of air in St Louis 81.6 66.6 70.9 82.5 58.3 71.6|72.4 96.6 78.6 76.1 80.0 73.2 85.5 73.2 68.6 74.0 68.7 83.0 86.9 94.9 75.6 77.3 86.6 71.7 88.5 87 72.5 83.0 85.8 74.9 61.7 92.2