Tell whether each of the following focuses on data production, displaying and summarizing data, probability, or statistical inference.
a. Great care is taken to ensure anonymity when surveying adolescents about their sexual experience, so that they will provide honest responses.
b. On average, age at first sexual experience was more than 1 year younger for respondents who had been forced.
c. If mean frequency of intercourse were the same for populations of adolescents in the three groups (first sexual experience consensual, a result of verbal coercion, or forced), it would not be unlikely to observe sample means such as those that were obtained in the survey.
d. In general, circumstances of the first intercourse experience play a role in age at first intercourse, but not in frequency of subsequent intercourse.