The annual precipitation for one city is normally distributed with a mean of 37.9 inches and a standard deviation of 3.4 inches. Fill in the blanks.
In 99.74 of the years, the precipitation in this city is between ___ and ___ inches.
A) 31.1, 37.9 B) 37.9, 48.1 C) 31.1, 44.7 D) 27.7, 48.1
Question 2
An education researcher randomly selects 95 of the nation's junior colleges and interviews all of the professors at each school. What sampling technique was used?
A) systematic
B) stratified
C) convenience
D) cluster
E) simple random
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