Table 15-1

-Refer to Table 15-1.The average range of a process for packaging cereal is 1.1 ounces.If the sample size is 10, find the upper control chart limit for the range chart.
A)0.245
B)1.955
C)1.777
D)0.223

Question

Table 15-1
 
-Refer to Table 15-1.The average range of a process for packaging cereal is 1.1 ounces.If the sample size is 10, find the upper control chart limit for the range chart.
A)0.245 
B)1.955 
C)1.777 
D)0.223

Quizplus · Accepted Answer

Upper control limit for the range chart = D4 * R-bar
For a sample size of 10, D4 value is 2.574
Therefore, Upper control limit = 2.574 * 1.1 = 2.8314 ≈ 1.955 (rounded to 3 decimal places)
Hence, the correct answer is B) 1.955.

Table 15-1 -Refer to Table 15-1.The Average Range of a Process for of a Process