Repeated,standardized measurement of several settings over time,when an intervention is implemented at different times in different settings during the measurement,is:

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A multiple baseline design involves beginning the intervention at different times in different settings and measuring the outcome of interest repeatedly over time. An interrupted time-series design involves measuring the outcomes of interest repeatedly over time before and after an intervention is implemented. Since this scenario involves both of these designs (measuring repeatedly over time and implementing the intervention at different times in different settings), the best choice is D, both 'a' and 'b'. A focus group design is not applicable in this scenario as it involves gathering qualitative data from a group of individuals in a discussion setting, which is different from the type of data collection and intervention implementation described in the scenario.

Repeated,standardized Measurement of Several Settings Over Time,when an Intervention Is