Determine whether the value is a parameter or statistic

In a weight loss research study the sample of 50 women lost an average of 2.5 pounds

What happens to the composition of an atom to cause it to become positively or negatively charged?

4sentences over a chronicle of a teen killer

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