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We need to find whether the blocks in this experiment are different diagnoses or type of care.

We know that

• The patients had asthma, diabetes, or high blood pressure, and they were assigned to a nurse or doctor at random (type of care).
• The treatments are being treated by a doctor and being treated by a nurse since the patients were randomly assigned to a doctor or a nurse (thus the types of care are the treatments).

The blocks cannot be therapies; instead, they must be patient features, and so the diagnoses must be separate blocks.

We need to find the reason for preference of randomized block design.

We know that

The patients had asthma, diabetes, or high blood pressure, and they were assigned to a nurse or doctor at random (type of care). The diagnosis are represented by the blocks.

Comparing the outcomes inside a completely randomized experiment would be far more challenging, because a person's health and happiness with their diagnoses could be closely associated (some diagnoses require more specialized care than other diagnoses).

We need to find the advantages and disadvantages.

The advantage of employing only diabetic patients is that the effects of the therapies are unaffected by the patients' diagnoses (because we excluded those without a diabetes diagnosis), making our results more credible for diabetes patients.

The disadvantage is that the findings will only apply to diabetic patients and not to the broader public (as we only included diabetes patients in the study).