A Design Engineer Wants to Construct a Sample Mean Chart

question 44

Multiple Choice

A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs his company produces.He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours.On three recent production batches,he tested service life on random samples of four bulbs,with these results: If he uses upper and lower control limits of 520 and 480 hours,what is his risk (alpha) of concluding service life is out of control when it is actually under control (Type I error) ?

• A)0.0026
• B)0.0456
• C)0.3174
• D)0.6826
• E)0.9544

---

Definitions:

Complete Proteins

Proteins that contain all of the essential amino acids as well as many nonessential ones.

Insulin Resistant

A condition where the body's cells do not respond effectively to insulin, often leading to type 2 diabetes.

Metabolic Syndrome

A constellation of central obesity, dyslipidemia, hypertension, and insulin resistance leading to increased risk of type 2 diabetes mellitus and cardiovascular disease.

Nutritional Assessment

The process of determining the nutritional status of individuals or populations through various measurements and evaluations of dietary intake, body composition, and biochemical markers.