Aclassmate decides to determine how many hours the average student at your school spends texting. to conduct her research, she interveiws 20 of her freinds. what kind of sample is this

How does cloud cover affect how much infrared light is reflected back to the ground?

How do economists measure the success, or shortcomings, of the economy?

The idea of a progressive income tax, which is still a standard taxing policy in the u.s. today, was aggressively sought by the populist party. select the best answer from the choices provided true or false