Which of the following explains what a researcher could do to increase chances of selecting a representative sample for a survey to evaluate customer satisfaction of people who use a certain cell phone service? a. survey all of the customers who recently purchased a new cell phone plan. b. survey randomly selected customers who terminated their cell phone contract early. c. survey all of the customers who use the cell phone service in one city selected at random. d. survey randomly selected customers from the list of all of the cell phone service customers.

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

55 bridesmaids want to make 325 325 decorations for a wedding. each decoration takes about 212 2 1 2 minutes to make. which response gives the best estimate for the amount of time each bridesmaid will spend making decorations?

What are “like terms”? why can we only add like terms?