What is the treatment in this study?

50% of my family is allergic to bee stings.

The average age of current US Senators is 64 years old.

The top 100 country hits in 2019.

The species of a bird.

Would it be beneficial to use blinding in the experiment? Justify your answer.

Determine whether each of the following is a population parameter or a sample statistic. Justify your answer.

Student ID numbers.

Use the following scenario to answer questions 11-12. A city council is interested in determining how satisfied residents are in their local parks. They determine a route through the city that passes by every house. They decide they will knock on doors and ask residents to answer the following question “How do your local parks make your life better?”. They randomly choose to start at the 18th house along the route and then stop at every 50th house after that.

What experimental design was used? Justify your answer.