Use the given information to find the number of degrees of freedom, the critical values and xa and the confidence interval estimate of or it is reasonable to assume that a simple random sample has been selected from a population with a normal distribution Platelet Counts of Women 90% confidence, n=29. S=65.6

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d-(Type a whole number)
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DF=
X 2/L=
X2/r=
Confidence interval estimate of
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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.