I would say no for a because he choose 20 7th graders. Everyone did not have a chance to be in the sample.
I would say b is a random sample because a random number generator was used and that gave all students and equal chance of being selected.
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.
3 answers
Do not listen to John. If you read carefully in part b the question says " Mr.Moore's sample is all eight graders." So it Is not random. Both parts are not random because they do not include all of the students in the different grades.
I hope you all get good grades today.
💕Z🌼
I hope you all get good grades today.
💕Z🌼
Wait I might have gotten it wrong. I got this answer from a different website and someone said that it was incorrect. So do not use this awnser.