There are 600 students at Washington High School. Peter wants to take a 30-student sample from the high school. Which method of selecting a sample is the least biased?

A. Randomly selecting 30 senior girls from the alphabetical, high school roster.

B. Selecting 30 students from the football team.

C. Selecting every 20th student from the alphabetical, high school roster.

D. Selecting the first 30 students from the alphabetical, high school roster.

Question

There are 600 students at Washington High School. Peter wants to take a 30-student sample from the high school. Which method of selecting a sample is the least biased? 

  A.    Randomly selecting 30 senior girls from the alphabetical, high school roster.  

  B.    Selecting 30 students from the football team.  

  C.    Selecting every 20th student from the alphabetical, high school roster.  

  D.    Selecting the first 30 students from the alphabetical, high school roster.

anonymous · Answer

I cant figure this one out sorry

anonymous · Answer

Its ok

campbell_st · Answer

I'd expect C as it is a systematic sample that allows every student to participate, if selected. 

A has bias as its only selecting senior girls. 

B will have bias as they are all footballers. 

D may have bias and several people from the same family...e.g. 3 members of the addams family go to school...

anonymous · Answer

Thank you so much