In Testing for Differences Between the Means of Two Paired

question 101

Multiple Choice

In testing for differences between the means of two paired populations, an appropriate null hypothesis would be:

• A) H0 : μD = 2
• B) H0 : μD = 0
• C) H0 : μD < 0
• D) H0 : μD > 0

---

Definitions:

R-134a Refrigerants

A type of hydrofluorocarbon (HFC) refrigerant used in automotive and residential air conditioning systems noted for its low impact on the ozone layer.

Electronic Leak Detector

Handheld devices with a flexible probe used to seek out refrigerant leaks. When a leak is detected, a flashing light or buzzer signals the technician.

Truck A/C System

The air conditioning system in a truck, designed to cool the interior of the vehicle to enhance occupant comfort.

Adding Oil

The process of introducing more oil to a system or component to ensure proper lubrication and functionality.