Question: A high school principal was concerned that several of her teachers were awarding "A" grades at vastly different rates-she had heard many complaints from students and parents. She compiled the data on the teachers and decided to see if there was in fact a statistically significant difference. Her first look at the grades gave her the idea that there was indeed a difference. Can you write the null and alternative hypotheses, select the appropriate statistical test, conduct the analysis, and then interpret the results? The data are as follows-the teacher's name and the number of "A" grades are given in parentheses: Thomas (6), Maryann (10), Marta (12), Berta (8), and Alex (10).