due to the limited number of QUESTION 22 Single subject experimental designs such as a multiple baseline design or reversal design are weak in participants a. External validity b. Statistical validity Internal validity d Construct validity QUESTION 23 3 point In the Travis and Sturmey (2010) study see Example Articles in Part II) that focused on reducing delustional statements of an adult with Intellectual disabilities, this single-case research design was used Multiple Baseline ABAB Single group None of these