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1) Beginning March 1 at 3:30, the investigator stands outside the entrance to North High and hands out questionnaires to passing students and asks that they and their parents return them.
2) Investigator asks North High's assistant principal to generate a random list of 200 student names and addresses. Each of these students and his or her parents are mailed a questionnaire.
3) The investigator asks the guidance counselor for the names of exactly fifty college-prep students, fifty general study students, fifty vocational educational students, and fifty other students of any kind.
4) The investigator asks North High's assistant principal to draw (randomly) fifty names from each class (freshman, sophomore, junior, and senior). Each of these students and his or her parents are mailed a questionnaire.
At a used-book sale, 100 books are adult books and 160 are children’s books. Of the adult books, 70 are nonfictions while 60 of the children’s books are nonfiction. A book is selected at random. i) What is the probability that the selected book is an..
Confidence intervals, significance, and effect size. Zou (2007) noted in an article that confidence intervals "encompass significance tests.
Answer the question in part (a) again, but this time use the conservative guess p^ = 0.5. By how much do the two sample sizes differ?
A random sample of 77 eighth grade students' scores on a nation mathematics assessment test has a mean score of 278 with a standard deviation of 31.
explain why it is necessary to have more than one standard procedure for defining and measuring central tenedncy and
Let X be the number of defectives Sara finds among the 100 randomly selected pens. How would I find the mean and standard deviation of x?
What is the purpose and function of The ?eld of study of statistics?
What is the lower limit of the 95% confidence interval? What is the upper limit of the 95% confidence interval?
The mean monthly expenditure on gasoline per household in Middletown is determined by selecting a random sample of 36 households. The sample mean is $68 with a random sample standard deviation of $17.?Calculate a 90% confidence interval for the me..
Case Background: You are to take on the role of Marley. Address your brief to Dan Block and Ed Spriggs. Your instructor will review the MPS portion of the MRP explosion with you before the MRP explosion can be completed.
Is the confidence interval from Part (a) wider or narrower than the confidence interval computed in the previous exercise?
MPH The graphs show the distribution of self-reported maximum speed ever driven by men and women college students who drive.
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