Can someone assist with this question I'm thinking its B.but not sure of my reasoning. Thanks
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.
A no - all 7th graders
probably a good sample though, since they will be close to the average in age, and thus also in height.
B no. It's a random sample, but just happened to produce an unexpected result. You could get 6 heads in a row flipping a coin. It's unusual, but randomly produced.
if you were to create a histogram of the data in the frequency table which interval would have the shortest bar?
Answer Choices
* 8-9
* 10-11
* 16-17
* 18-19
There is no way to know which interval would have the shortest bar without knowing the actual frequencies within each interval.
so B?
No, the answer is still unknown without having the frequency values.
what age group has the fewest subscribers?
Answer Choices
* 20-29
* 30-39
* 40-49
* 60-69