What are the benefits and drawbacks of a cross-sectional study versus a longitudinal study?
What will be an ideal response?
Answer: A cross-sectional study collects data at one time and compares people of different ages. The benefits are that cross-sectional studies are easier to conduct and can be less costly. The downside is that the younger participants are different people from the older ones, so they may differ in ways other than age because they represent different generations.
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Hart and Risley (1999) found differences in children's vocabulary at 30 months old. To what did they attribute these differences?
a. the average number of minutes of television children watch per day b. the average number of words spoken to children per minute c. the average number of books read to children each night d. the nutritional deficiencies of the children
Roger is conducing a study to determine how three levels of a single IV affect participants in
three groups formed with random assignment. Which of the following statistical tests should he use when analyzing data? A) three-way ANOVA for independent groups B) three-way ANOVA for correlated groups C) one-way ANOVA for independent groups D) one-way ANOVA for correlated groups E) none of the above