new filtering device is installed in a chemical unit. Before its installation, a random sample yielded the following information about the percentage of impurity: y1 = 13.2, S12 =171.1, and n1= 16 After installation, a random sample yielded: y2 = 10.1, S22 = 74.7, n2 = 20 a) Can you conclude that the two variances are equal? Use α = 0.05. b) Has the filtering device reduced the percentage of impurity significantly? Use α = 0.05.
new filtering device is installed in a chemical unit. Before its installation, a random sample yielded the following information about the percentage of impurity: y1 = 13.2, S12 =171.1, and n1= 16 After installation, a random sample yielded: y2 = 10.1, S22 = 74.7, n2 = 20 a) Can you conclude that the two variances are equal? Use α = 0.05. b) Has the filtering device reduced the percentage of impurity significantly? Use α = 0.05.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A new filtering device is installed in a chemical unit. Before its installation, a random sample yielded the following information about the percentage of impurity:
y1 = 13.2, S12 =171.1, and n1= 16
After installation, a random sample yielded:
y2 = 10.1, S22 = 74.7, n2 = 20
a) Can you conclude that the two variances are equal? Use α = 0.05.
b) Has the filtering device reduced the percentage of impurity significantly? Use α = 0.05.
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