9. Which of the following are nonexperimental research approaches? Select all that apply. a. Randomly assigning participants

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9. Which of the following are nonexperimental research approaches? Select all that apply.

a. Randomly assigning participants to treatment and control groups

b. Comparing scores on two tests in a correlation study

c. Comparing children with communication disorders to age-matched peers

d. Comparing baseline and treatment performance in a single subject study

e. Surveying of a random sample of speech-language pathologists

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