.In a survey of introductory statistics students, an instructor asked her students how many flip-flops they have. Suppose that the intent is to study whether there is an association between number of flip-flops and a person's sex.

1. Identify whether the study is an experiment or an observational study. Explain. (2 pts)
2. Identify the observational units. (1 pt)
3. Identify the explanatory and response variables. Also, for each variable identify whether it is categorical or quantitative. (2 pts)
   1. Number of flip flops which is quantitative
4. Which of the following is the appropriate null hypothesis? Circle one.
   1. There is an association between a person's sex and the number of flip-flops.
   2. There is no association between a person's sex and the number of flip-flops.
   3. On average, men have more flip-flops than women.
   4. On average, men have fewer flip-flops than women.
5. Which of the following is the appropriate alternative hypothesis? Circle one.
   1. There is an association between a person's sex and the number of flip-flops.
   2. There is no association between a person's sex and the number of flip-flops.
   3. On average, men have more flip-flops than women.
   4. On average, men have fewer flip-flops than women.

Here are a few summary statistics about the data:

\fGender Flipflops Female 10 Male 1 Female 3 Male 10 Female 3 Male 1 Female 2 Female 6 Female 7 Female 5 Female 16 Female 3 Female 5 Male 1 Female 3 Female 4 Female 6 Female 9 Female 6 Female 10 Female 4 Female 2 Female 8 Female 8 Male 1 Female 4 Female 7 Female 7 Male 3 Male 1 Male 2 Female 2 Female 12 Female 7 Female 2 Female 6 Female 2 Male 2 Female 7 Female 2 Female 14 Female 10 Female 6 Female 2 Male 1 Female 10 Male 1 Male 1 Male 8 Female 10