In the context of the qualities of selection predictors, validity refers to:

What is the measure of ∠m? 81° 65° 53° 98° answer plz

Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b