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What's wrong? Explain what is wrong with each of the following random selection procedures and decribe how you would do the randomization correctly
(a) To determine the reading level of an introductory statistics text, you evaluate all the written material in the third chapter.
(b) You want to sample student opinions about a proposed change in procedures for changing majors. You hand out questionnaires to 100 students as they arrive for class at 7:30 A.M.
(c) A population of subjects is put in alphabetical order, and a simple random sample of size 10 is taken by selecting the first 10 subjects in the list.
If we simply discard this one outlier and compare groups using Student's T or Welch's method, what criticism might be made even if we could ignore problems with non-normality?
urn 1 has five white and seven black balls. urn 2 has three white and twelve black balls. we flip a fair coin. if the
question what type of educational background do ceos have? in one survey 344 ceos of medium and large companies were
On the faculty of a university there are three professors named Smith
If a transit employee provides a strand of hair for drug testing, state the null and alternative hypotheses in verbal terms, then identify what would constitute a Type I error and a Type II error in this situation.
the defect rate for data entry of insurance claims 1.5. what if the sample size used were 50 with 3 sigma? what if the
One measure of the effectiveness of cancer drugs is their ability to reduce the number of viable cancer cells in laboratory settings. In this experiment, the A549 line of malignant cells is plated onto petri dishes with various concentrations of t..
Find a 99% confidence interval for the mean number of lightning strikes per day worldwide.- Do you think the normality assumption in this problem is reasonable? Why or why not?
Using the notation of this section, let U be the number of observed values of X in the smallest d items of the combined sample of m + n items.
Many samples, each of 100 observations, are drawn from a population in which there is a correlation of 0.70 between two variables. How often would you expect to find a statistically significant correlation?
Statistics students were asked to fill one-cup measuring cups from boxes of Kellogg's Raisin Bran cereal, and then to count the number of raisins in the one-cup serving. The results, from 13 students, were sampled and are shown here. 23, 33, 44, 3..
People are driving their cars like maniacs tonight. There must be a full moon.
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