2. In the coin toss study with your class: a. What are the observational units in this study? b. What is the variable that is recorded? C. Describe the parameter of interest in words. (Use the symbol a to represent this parameter.) d. If people do not have a tendency to pick heads more often than tails (or tails more often than heads), what would you expect the numerical value of the parameter to be? Is this the null hypothesis or the alternative hypothesis? e. If people do have a tendency to pick heads more often than tails, what can you say about the numerical value of the parameter? Is this the null hypothesis or the alterna- tive hypothesis? the coin heads or tails The parameter is ' population proportion of choosing heads ' which is denoted by pi We expect the parameter to be pi to be equal to 0.5 when people donot have a tendency to pick heads more often than tail. null We expect the parameter to be pi to be greater than 0.5 when people have a tendency to pick heads more often than tails. alt