Digby collected data related to student attitudes about evening classes. He asked three different classes to complete his survey, and the average response in each of the three classes was 3.45, 3.27, and 3.30. Digby is concerned about the difference, and asks his friend for advice. His friend (correctly) suggests: Question 69 options: That this must be due to response bias in the different groups of students. That there must be something wrong with the scale, and that Digby should collect more data. That this must be due to random variation between the samples, and that he should not worry. That this must be due to random variation between the samples, and that if he collects more data, the variation will be eliminated