When students do not understand an author’s vocabulary, they often miss subtleties of meaning in the text; thus, learnin

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When students do not understand an author’s vocabulary, they
often miss subtleties of meaning in the text; thus, learning
vocabulary is recognized as one of the most important skills in all
subject areas. A school system is planning a study to see which of
two programs is more effective in ninth grade. Program A involves
teaching students to apply morphemic analysis, the process of
deriving a word’s meaning by analyzing its meaningful parts, such
as roots, prefixes, and suffixes. Program B involves teaching
students to apply contextual analysis, the process of inferring the
meaning of an unfamiliar word by examining the surrounding
text.
(a) Explain the purpose of incorporating a control group in this
experiment.
(b) To comply with informed consent laws, parents will be asked
their consent for their children to be randomly assigned to be
taught in one of the new programs or by the local standard method.
Students of parents who do not return the consent forms will
continue to be taught by the local standard method. Explain why
these students should not be considered part of the control
group.
(c) Given 90 students randomly selected from ninth-grade
students with
parental consent, explain how to assign them to the three groups,
Program A, Program B, and control, for a completely randomized
design.