Question

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A department chair wants to monitor the percentage of failing students in classes in her department. Each class had an enrollment of 50 students last spring. The number of failing students in the 10 classes offered that term were 1, 4, 2, 0, 0, 0, 0, 0, 0, and 3, respectively. Compute the 3-sigma control limits for an appropriate control chart. What is the upper control limit? (keep four decimal places if necessary). Answer: Check

Answer 1

Using P-chant: Sample size (n) = 50 Fraction failing (p) Now, E (No. of failures) nx No. of samples → P = 0.02 H4t2tototototo+0+3 50 x 1o - Control Control Cimits are :- (2=3 for 3 sigma) 0.02 (1-0.02) - 0.0793 مسات 0 • 0.02+ 3 P 8 +2] Plips n