RoboCall Study: The research goal is to determine the average number of robocalls received each day by adults in Pennsylvania. Presented below are four potential options for collecting a sample for the RoboCall study. Determine which one of the four potential options shown below is most likely to result in a representative sample and explain why. In preparing your answer, include the following terms:

• representative sample,
• sampling bias,
• sampling approach (e.g., simple random sample, stratified random sample, convenience sample, etc.),
• and any other concepts from the assigned readings and/or class sessions you deem helpful and appropriate.

Sampling Method 1:

The 537 adults in Pennsylvania who respond to a survey published in a newspaper.

Sample Method 2:

The first 537 people to visit a particular Philadelphia grocery store on a Sunday.

Sample Method 3:

A set of 537 Pennsylvanians with phone numbers randomly selected from a list of all phone numbers in Pennsylvania.

Sample Method 4:

A set of 537 Pennsylvanians randomly selected from a list of all licensed car owners in Pennsylvania.