.0000 Sprint 4:00 PM webwork.uoregon.edu Previous Problem List Next (1 point) (a
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Question
.0000 Sprint 4:00 PM webwork.uoregon.edu Previous Problem List Next (1 point) (a) Which of the following is an example of a matched pairs design? A. A teacher calculates the average scores of students on a pair of tests and wishes to see if this average is larger than 80% and B. A teacher compares the pre-test post-test scores of students. C. A teacher compares the scores of students in her class on a standardized test with the national average score D. A teacher compares the scores of students using a computer based method of instruction with scores of other students using a traditional method of instruction. (b) Suppose we were not sure if the distribution of a population was normal. In which of the following circumstances would we NOT be safe using a t procedure? A. The mean and median of the data are nearly equal B. A stemplot of the data has a large outlier C. A histogram of the data shows moderate skewness D. The sample standard deviation is largeExplanation / Answer
ans=
1) B
A teacher compares the pre-test and posttest scores of students.
2) B
A stemplot of the data has a large outlier.
3) A
You may use the t procedure if your sample size is large, say, at least 50
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