A simplified experiment showing the setup of a pith ball (a circular object) attached by a string to an insulated stand. The researcher tested how far away a charged glass rod can be held while still causing an attraction to the pith ball. Which statements accurately describe this experimental design? Select ALL that apply. A) An appropriate control could be a non-charged glass rod used for comparison. B) The dependent variable is the distance of the glass rod is from the pith ball. C) The independent variable is the distance of the glass rod is from the pith ball. D) The dependent variable is the level of attraction that the pith ball has to the charged rod. E) The independent variable is the level of attraction that the pith ball has to the charged rod.
Answers: 2
Physics, 21.06.2019 18:10
An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.
Answers: 2
Physics, 22.06.2019 03:30
When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy
Answers: 3
Physics, 22.06.2019 05:30
What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?
Answers: 3
Physics, 22.06.2019 17:00
If you put a helium-filled balloon in the refrigerator, what will happen?
Answers: 1
A simplified experiment showing the setup of a pith ball (a circular object) attached by a string to...
Biology, 03.07.2019 16:30
Mathematics, 03.07.2019 16:30
Mathematics, 03.07.2019 16:30
Computers and Technology, 03.07.2019 16:30
Biology, 03.07.2019 16:30
Arts, 03.07.2019 16:30
Biology, 03.07.2019 16:30