Classify each sampling method as systematic, convenience, stratified, cluster, or none of these

Classify each sampling method as systematic, convenience, stratified, cluster, or none
of these. Does the method constitute a random sample? If it is random, is it simple random?

1. You’re considering a lunch-delivery business and want to gather lunch-break data on a sample of
employees from your target population of 20 local businesses.

• You randomly select 3 of the businesses and interview all the employees from those businesses.
• You get a sample of 100 by randomly selecting 50 employees from labor and 50 employees from
  management.

2. Suppose you want to gather household income information from a sample of 10
houses on North Street. The house numbers start at 1 and end at 100 without any missing house
numbers.

• You randomly select 5 even numbered houses and 5 odd numbered houses.
• You take every 10 th house starting at number 7.
• You group the houses as #’s 1 - 10, 11 - 20, ...., 91 - 100. You then randomly select one of these groups to be in the sample.
• You randomly select 10 numbers between 1 and 100 and select those 10 houses.
• You include the first 10 houses where someone answers the door.