Question

li designed a survey to determine how comfortable students at her middle school are with fractions. there are 600 students in her middle school. the students are equally distributed among grade levels. she selected a sample of 28 students in her first - period class. which best explains lis sample? nonrandom and unbiased random and biased nonrandom and biased random and unbiased

Explanation:

A random sample would involve selecting students from all grade - levels in a way that each student has an equal chance of being chosen. Li selected students only from her first - period class. This is a non - random sample because not all students in the middle school (from all grade - levels) had an equal chance of being selected. Also, since the sample is not representative of all students (only from one class), it is biased.

Answer:

nonrandom and biased