Introduction to Probability and Statistics
Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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Chapter 12.4, Problem 12.7E

(a)

To determine

To find: the least-squares line for the data.

(b)

To determine

To plot: the six points and graph the line whether the line provides a good fit to the data points.

(c)

To determine

To predict: the value of y when x=3.5 by using the least-squares.

(d)

To determine

To fill: the missing entries in the MINITAB analysis of variance table.

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To  evaluate  the  success  of  a  1-year  experimental  program  designed  to  increase  the  mathematical achievement of underprivileged high school seniors, a random sample of participants in the program will be selected and their mathematics scores will be compared with the previous year’s  statewide  average  of  525  for  underprivileged  seniors.  The  researchers  want  to  determine  whether the experimental program has increased the mean achievement level over the previous year’s statewide average. If alpha=.05, what sample size is needed to have a probability of Type II error of at most .025 if the actual mean is increased to 550? From previous results, sigma=80.

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Introduction to Probability and Statistics

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