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Compute the standard deviation for both sets of data presented in problem 3.13 and reproduced here. Compare the standard deviation computed for freshmen with the standard deviation computed for seniors. What happened? Why? Does this change relate at all to what happened to the mean over the four-year period? How? What happened to the shapes of the underlying distributions?
Conduct a one-way analysis of variance to test for an overall difference among the five population means.- Construct 95% Bonferroni confidence intervals only for the differences between each treatment plastic population mean and the control, styrene..
Generate a vector x = (x1,..., x10,000) con- sisting of 10,000 random standard Normals. Let y = (y1,..., y10,000) where yi = exi . Draw a histogram of y and compare it to the pdf you found in part (a).
In a class roster of 18 students, what are the chances that there are at least 2 people with the same birthday (same day, not same year)?
question 1in a study of distances travelled by buses before the first major engine failure a sampling of 191 buses
question assuming a two-tailed test with alpha .05 how large a correlation is needed to be statistically significant
how much the mean changes?
According to the Wall Street Journal, the average American jockey makes only $25,000 a year. Suppose you try to disprove this claim against a right-tailed.
A random sample of 100 entering freshmen is selected. What is the distribution of the mean composite ACT score, for the University?
Humanities, 372; Natural Science, 415; Social Science, 511; Business Administration, 619; Philosophy, 196. Create a Pareto chart representing this information.
Under what situations must the nonparametric test be used? Describe in detail. Write down the strengths and weaknesses of nonparametric tests?
Suppose you have a stock portfolio where 28% of the stocks earned a return of 12.2%, 12% earned a return of 15.1%, 24% of the stocks earned a return of 0%, 18% of the stocks earned a return of -1.5%, and 18% of the firms earned a return of -3%. (A..
Determine the cost of providing care - How would you measure the cotinine level in the body? Explain the result.
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