Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics  with Pearson eText -- Access Card Package (13th Edition)
Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)
13th Edition
ISBN: 9780133873641
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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Chapter 11, Problem 28PS

The data in Concrsts2 represent the compressive strength in thousands of pounds per square inch of 40 samples of concrete taken 2, 7, and 28 days after pouring.

a. At the 0.05 level of significance. is there evidence of a difference in the mean compressive strength after 2, 7, and 28 days?

b. If appropriate, use the Tukey procedure to determine the days that differ in mean compressive strength. Use α=0 .05 .

c. Determine the relative efficiency of the randomized block de-sign as compared with the completely randomized (one-way ANOVA) design.

d. Construct boxplots of the compressive strength for the different time periods.

e. Based on the results of (a), (b), and (d), is there a pattern in the compressive strength over the three time periods?

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In a town with 5000 adults, a sample of 50 is selected using SRSWOR and asked their opinion of a proposed municipal project; 30 are found to favor it and 20 oppose it. If, in fact, the adults of the town were equally divided on the proposal, what would be the probability of observing what has been observed? Approximate using the Binomial distribution. Compare this with the exact probability which is 0.0418.
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Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)

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