A State university is interested in monitoring and controlling the number of students dropping every semester. The average academic drops in every semester is expected to be around 4 percent. Information about last 4 semester is as follows: Sample # Sample Size Number of Drops 1 200 12 2 120 12 3 200 10 4 150 14

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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A State university is interested in monitoring and controlling the number of students dropping every semester. The average academic drops in every semester is expected to be around 4 percent. Information about last 4 semester is as follows:

Sample # Sample Size Number of Drops
1 200 12
2 120 12
3 200 10
4 150 14

Set up appropriate 3-standard deviation control limits for the problem. Are samples 1-4 under control? Explain.

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