As the confidence level goes up, the reliability goes ______ and the precision goes _____.
up, down
The level is the proportion of samples for which the confidence interval will cover the true value. Therefore as
the level goes up, the reliability goes up. This increase in reliability is obtained by increasing the width of the
confidence interval. Therefore as the level goes up the precision goes down.
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Simplify the expression: (0.06F2G3- FG- 2F2) ÷ 0.2F.
Fill in the blank(s) with the appropriate word(s).
Modifications such as adding a liquid line solenoid at the outdoor unit, using a hard shutoff thermal expansion valve at the evaporator, and adding a compressor hard start kit are recommended when:
A) The refrigerant line length is less than 50 feet. B) The system is converted from 22 to 410a. C) The refrigerant line length is over 40 feet. D) The refrigerant line length is over 80 feet.
The doping level in semiconductors relates to the
A) size of the crystal structure. B) amount of N-type material. C) amount of impurities. D) amount of P-type material.
Why should service technicians be familiar with company pricing policies?
A) The technician should always try to sell the service customer new equipment. B) Cost is often the foremost question in the customer's mind. C) Most customers are not concerned with the cost, leaving the technician entirely in charge of repair costs. D) Technicians should always try to use parts and refrigerant that are on sale first.