139k views
4 votes
Historically, the average diameter of the holes drilled has been 0.25 cm and the average range has been 0.10 cm. Samples of size 4 will be collected. For the R-chart, what is the value of upper control limit

User Ishimwe
by
6.6k points

1 Answer

4 votes

Solution :

Given the average range of the holes drilled = 0.10 cm

The average diameter of the holes drilled = 0.25 cm

The sample size = 4

For the sample size of 4, the factor for control limit for the range (
D_4) = 2.28 (From the table of constants for X-bar and R-chart)

The upper control limit for the R-chart = R-bar x
D_4

= 0.10 x 2.28

= 0.228

Therefore, the answer is greater than 0.202 but less than or equal to 0.302

User Sibusiso
by
7.1k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.