Question

Q 1. Part 1. Suppose that over the last 20​ weeks, a law firm had a total of 1045 consultation​ calls, and that 126 of them did not get an appointment for an initial consult within 24 hours. What is​ (are) the appropriate control​ chart(s) to use for these​ data?

A. ARL chart

B. c chart

C. Pareto chart

D. p chart

Q1. Part 2. A manufacturer of solid wood cabinetry requires that its lumber has moisture content​ (MC) between​ 5% and​ 9%.

​Twenty-five ​subgroups, each consisting of six pieces of​ lumber, yield an average MC of​ 6.95% and an average range of​ 2.2%. What is the estimated process standard deviation

​(ModifyingAbove sigma with caretσ​)?

A. ​0.87%

B. ​0.18%

C. ​2.74%

D. ​1.22%

Q1. Part 1 option C (Pareto chart) is incorrect.

Can you please give me the answers to Q1. Part 1& 2 with working and explanations? Thank you

Answer 1

Part 1:

C charts are used to monitor the number of nonconformities on a unit in a sample of data.

The appropriate control​ chart(s) to use for these​ data is c-chart which measures the number of calls which did not get an appointment for an initial consult within 24 hours.

B. c chart

Part 2:

Process standard deviation =  

for subgroup of sample size 6 is 2.534 (From control chart constants table)

= 2.2 / 2.534

= 0.8681926 %

  ​0.87%

A. ​0.87%