A hot tub manufacturer wants the thermostat to control water temperature to within one degree when set at 130 degrees Fahrenheit
They randomly select 10 hot tubs, set the thermostats to 130, and record the following data with an infrared thermometer that has recently been calibrated.
Temp 129.9 129.7 130.2 129.7 129.8 130 129.6 131 130.3 129.8
What is their process capability?
What will be an ideal response?
Answer: =
=
=
= 130.0
=
= 0.416
The process is centered so the process capability ratio is calculated as
CP =
CP =
CP = 0.80
Their process capability is poor.
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