Samples of Size 300, 400, and 200 Have Been Selected

question 34

Multiple Choice

Samples of size 300, 400, and 200 have been selected from each of three large populations, producing sample proportions of 0.4, 0.3, and 0.5 respectively.The pooled sample proportion here would be

• A)0.413
• B)0.378
• C)0.453
• D)0.383
• E)0.397

---

Definitions:

Cylinder Leakage Test

A test performed on a suspect cylinder to determine where the pressure is going. The cylinder leak detector uses the shop air supply and a regulator to pressurize the cylinder, and the rate of leakage is displayed on the gauge.

Throttle Body

A component of the air intake system that controls the amount of air flowing into an engine's combustion chamber.

Burned Intake Valve

A valve in the engine that has been damaged by excessive heat, leading to loss of efficiency or engine failure.

Power Balance Test

A test used to determine if each cylinder is contributing power to overall engine output. During the test, fuel injectors are disabled and the change in engine rpm is recorded. If a cylinder is not producing power, there will not be an rpm drop when that cylinder’s injector is disabled, alerting you to the problem cylinder.