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Which of the designs below would be best suited to ANCOVA? a. Participants were randomly allocated...
Which of the designs below would be best suited to ANCOVA?
| a. | Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. The researcher was interested in the relationship between the therapist’s ratings of improvement and stress levels over a 3-month treatment period. | |
| b. | Participants were allocated to one of two stress management therapy groups, or a waiting list control group based on their baseline levels of stress. The researcher was interested in investigating whether stress after the therapy was successful partialling out their baseline anxiety. | |
| c. | Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. Their baseline levels of stress were measured before treatment, and again after 3 months of weekly therapy sessions. | |
| d. | Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. Their levels of stress were measured and compared after 3 months of weekly therapy sessions. |
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