## PLEASE HELP 30 POINTS!! Mr. Moore is installing new work benches in the wood shop. He wants the height of the benches to be best

PLEASE HELP 30 POINTS!!

Mr. Moore is installing new work benches in the wood shop. He wants the height of the benches to be best for students standing and working on projects. He decides to use the mean height of the students in the school as a guide. The school has 6th, 7th, and 8th-grade students. Rather than using the heights of all the students in the school, he decides to take a sample of students.

a. Suppose Mr. Moore decides to use 20 seventh graders as the sample. Is this sample a random sample? Explain your reasoning.

b.Mr. Moore decides to use a random number generator to select 20 students from the school. Suppose that when choosing 20 students using the random generator on the graphing calculator, Mr. Moore’s sample is all eighth graders. Does that mean the sample is not a random sample? Explain your reasoning.

THIS IS A TEXT QUESTION SO NO MULTIPLE CHOICE ANSWERS HERE

## Answers ( )

Answer:

a) No. A random sample is one in which every one has an equal chance of being selected. Here 6th ang 8th graders have no chance of being selected

b) This is a random sample. Every one had an equal chance of being selected. All 8th graders is just a coincidence