It is called a when members of the population volunteer to take part in the sample.

random sample
self-selected sample
biased sample
convenience sample

This schedule shows the opportunity cost of producing doughnuts, bagels, and croissants. refer to the schedule and use the drop-down menu to answer each question. on day 2, raj makes 70 more bagels than on day 1. what is the opportunity cost of producing 70 more bagels? on day 3, raj makes 50 more croissants than on day 2. what is the opportunity cost of producing fifty more croissants?

The principle that the geoglical processes that we see today have occurred through out earths history is called

In ancient egypt, the pharaoh collected from the peasant farmers. a. oil b. gold c. lumber d. taxes