Based on the reference text, what is the author's view on the attention given to concertgoers by scientists?

在技术文档中，以下哪项内容通常不包括在用户使用手册中？

In a hypothetical scenario, a researcher claims that a specific vaccine causes a rare neurological disorder. If this claim is based on a study with significant methodological flaws, what is the most appropriate response from the scientific community?

设随机变量X的概率密度为f(x) = kx^a, 0 < x < 1，且E[X] = 3/4，那么k和a的值分别是多少？

在NLP的‘重塑技术’中，以下哪个步骤不是用来帮助个体消除负面情绪反应的关键步骤？