Thank you for answering, will leave a thumbs up. please include explanations step by step for understanding

Complete the following questions.

Scenario: I wish to gather a sample of students in order to conduct a brief, pen/paper survey.

I am aiming to gather data concerning attitudes and beliefs concerning medical marijuana among

college students. I go to the breezeway and set up a table where students may opt to come by and

complete the survey. I set up the same table each day for a week so that students can also tell their

friends to come by and complete this survey, thus maximizing the number of participants in my

study. I ultimately collect data from 85 students whose mean age is 21 (standard distribution = 2.5)

1. What is my sampling frame?

2. What type(s) of sampling is did I use -- simple random, cluster, stratified, systematic,

convenience, snowball?

3.What might be some problems with this sampling