单项选择题 If data are grouped into intervals and the number of items in each group is listed, this could be called a （）

单项选择题 Which of the following is not the goal of descriptive statistics?（）

单项选择题 A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.