1. You are studying the relationship between whether or not a high school student is employed (binary) and the number of hours they have earned doing community service (continuous). What would be the null hypothesis for the test of statistical significance (two-tailed)?

• There is no difference in average community service hours between students who are employed and students who are not employed, in the population.

• There is no difference in employment rates between students who have no community service hours and students who have many community service hours, in the population.

• The difference in average community service hours between students who are employed and students who are not is a result of chance alone.