For an xbar and R control chart use the following summary st

For an xbar and R control chart use the following summary statistics: = 10.0, =2.3, and n=4 to answer the following questions.

Calculate an unbiased estimate of:

2.4965

1.117

2.039

2.883

Solution

Unbiased estimate = (2.4965 + 1.117 + 2.039 + 2.883)/4

= 8.5355/4

= 2.1339