JoeyDoesMath2399
28.09.2019 •
Mathematics
What is the surface area of this figure
428ft
560ft
632ft
888ft
Solved
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Ответ:
Left and Right = 2[ 6 x 14 ]= 2 [84] = 168 ft²
Top and Bottom = 2 [14 x 6] = 2[84] = 168 ft²
Total = 296 + 168 + 168 = 632 ft²
632 ft²
Ответ:
The dean of students mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term. What sampling method was used?
Solution: The sampling method used here is stratified sampling. Because the sample included the students from each of the freshman, sophomore, junior and senior classes.
Stratified sampling is is a probability sampling method and a form of random sampling in which the population is divided into two or more groups (strata) according to one or more common attributes and and a sample is selected by some design within each group.