Questions from Total Quality Management

Q: The upper specification limit for the resistance of coils is 30 Ω

The upper specification limit for the resistance of coils is 30 Ω. The distribution of coil resistance is known to be normal with a standard deviation of 5 Ω. It is preferred to reject batches that ha...

Q: The lower specification limit for the breaking strength of yarns is 25

The lower specification limit for the breaking strength of yarns is 25 g. The distribution of the breaking strength of yarns is normal with a variance of 6. It is desirable that lots with a mean such...

Q: The tensile strength of an alloy has double specification limits. If

The tensile strength of an alloy has double specification limits. If the process average tensile strength is below 800 kg/cm2 or above 1200 kg/cm2, it is desired to accept such lots with a probability...

Q: The length of connector pins has an upper specification limit of 45

The length of connector pins has an upper specification limit of 45 mm and a lower specification limit of 40 mm. It is desirable that lots with a mean such that 8% of the product is nonconforming, eit...

Q: The proportion of carbon monoxide in exhaust gases has an upper specification

The proportion of carbon monoxide in exhaust gases has an upper specification limit of 0.30. Emission control devices are being tested to meet such requirements. We wish that devices with an average c...

Q: Distinguish between the use of the mean, median, and mode

Distinguish between the use of the mean, median, and mode in quality control applications. When do you prefer to use the trimmed mean?

Q: Refer to Exercise 10-52 regarding the proportion of carbon monoxide

Refer to Exercise 10-52 regarding the proportion of carbon monoxide in exhaust gases, which has an upper specification limit of 0.30. Ifthe average carbon monoxide content is 1 standard deviation belo...

Q: Unleaded gasoline must meet certain federal standards. The octane number for

Unleaded gasoline must meet certain federal standards. The octane number for a particular brand must be at least 89. The standard deviation of the octane number is estimated to be 4. It is preferred t...

Q: A dairy has to control the amount of butterfat in its low

A dairy has to control the amount of butterfat in its low-fat milk. The upper specification limit of the fat content is 4 g for 4-L containers. The standard deviation of the fat content for these cont...

Q: The thickness of silicon wafers is an important characteristic in microelectronic circuits

The thickness of silicon wafers is an important characteristic in microelectronic circuits. The upper specification limit for the thickness is 0.015 mm. It is estimated that the standard deviation of...