Reference no: EM133263649

A researcher wants to investigate the following research question: Does including a number line on pages of counting books promote children's learning to count, compared to when no number line appears on counting book pages? She plans a study to compare two books, Count with Quack (which does nothave any number lines) and Count with Bumble (which has a number line on about ten pages). The researcher gives 20 adults (each of whom is a parent of a three year old) a copy of one of the books. She asks the parents to keep the books at home and read the book to their child three or four times per week, for six weeks. At the beginning and end of the six-week period, the researcher tests the 3 year olds' counting skills. At the end of the study, she compares the counting skills of children who were read Count with Quack and children who were read Count with Bumble.

Which of the following is the best description of the key features of this study design?