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Random vs Biased

Are these samples random samples of the population, or are they biased?

Description of SampleRandom or Biased
A shirt manufacturer wants to check quality control of their products. The plant manager decides to check every 50th shirt inspected by the employees. Random - this would create a sample that is representative of the general quality of all the shirts inspected at this manufacturing plant.
Each homeroom class randomly selects one student to represent their class on an student panel tasked with organizing the upcoming dance. Random - this would create a group that is a representative sample of the general population of students at this school.
A email-in survey is taken by a retail store to see how many shoppers enjoy their new self checkout stations. Biased - this only takes into consideration the people who are willing to take the time to email in with their opinion. This will likely only elicit responses of people who have very strong feelings one way or the other about the self checkouts.
A survey is conducted at the local shopping mall about sports they played in high school. Biased - this only asks people who go to a shopping mall. Not everyone goes to shopping malls so this isn't a good representation of the population
Every thirtieth student who enters the school is asked to name their favorite animal. Random - this would give a good mix of students, so a representative sample of students in the school.
A well known makeup tutorial content creator on instagram asks a question in her story about makeup routine habits. A student uses that information in her school report about the morning routines of students at her school. Biased - People who respond to this story survey are already followers of the makeup account on instagram. Chances are they are more interested in makeup than the general population. This isn't a representative sample of *all* the students in her school
Created by: emilylake731
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