Question

1. Suppose you wanted to determine whether students who close their eyes are better able to estimate when 30 seconds have passed than students who do not close their eyes.

(You ask students to tell you when to stop a stopwatch after they think 30 seconds have passed.) You find the first 50 students arriving at school one day.
For those 50, you flip a coin to decide whether or not they will close their eyes during the test. Then, you compare the amounts by which each group overestimated or underestimated.
a. Did this study use random sampling? Explain your answer by describing what purpose random sampling serves in such a study.
b. Did this study make use of random assignment? Explain your answer by describing what purpose random assignment serves in such a study.
c. Would the study described above be an observational study or an experimental study? Explain how you are deciding.

Answer 1

a. yes, it use random sampling

b. yes it use random assignment

c. it is by observation

Step-by-step explanation:

a. A random sampling is a sampilng method where every member has equal chance of being selected. The purpose is to allow all the students to be part of the studies. No one student is left out.

b. A random assignment is an assignment that gives all member equal opportunity to be part of it. the study above is a random assignment and it serves the purpose of assigning all the students it the study.

c. the study is done through observation.