to determine if a new teaching strategy leads to higher test scores within a school district, students were randomly assigned to one of two english teachers - mrs. lawrence, who used the new teaching strategy, or mrs. hendrix, who used the standard teaching strategy. at the end of the year, each class took the same standardized test. students taught by mrs. lawrence (group 1) had an average test score of 97 and students taught by mrs. hendrix (group 2) had an average test score of 71. the correct null and alternative hypotheses for this situation would be: