why is it important to use randomization in a scientific experiment
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HESI PN Nutrition Practice Exam

1. Why is randomization important in a scientific experiment?

Correct answer: B

Rationale: Randomization is crucial in a scientific experiment to eliminate bias in the assignment of subjects to groups. By randomly assigning subjects, it helps ensure that any differences observed in the outcomes are due to the experimental treatment and not to preexisting differences between groups. Choice A is incorrect because randomization does not guarantee representativeness but rather minimizes the impact of confounding variables. Choice C is not entirely accurate; while randomization can contribute to accuracy and validity, its primary purpose is to reduce bias. Choice D is incorrect as the goal of randomization is not to balance the number of subjects but to prevent systematic differences between groups.

2. How should a healthcare provider address concerns about a child’s developmental milestones?

Correct answer: B

Rationale: Correct Answer: Providing resources for early intervention services is crucial for addressing developmental concerns and supporting the child's growth and development. Early intervention is key to improving outcomes. Recommending delaying intervention until school age (Choice A) is not advised as addressing issues early leads to better results. Suggesting dietary changes (Choice C) is not the primary approach to addressing developmental milestones. Avoiding further assessment (Choice D) can impede the timely identification and management of developmental delays.

3. How should a healthcare provider approach the care of a child with juvenile idiopathic arthritis (JIA)?

Correct answer: B

Rationale: Encouraging joint mobility exercises is the appropriate approach to caring for a child with juvenile idiopathic arthritis (JIA). These exercises help maintain joint function and reduce stiffness, which are crucial in managing the condition. Choices A, C, and D are incorrect. Promoting weight maintenance is more relevant than weight gain as maintaining a healthy weight is important in managing JIA. Avoiding physical inactivity is not recommended as controlled and appropriate physical activities can help improve joint flexibility and overall health. Ensuring a balanced diet, which includes adequate protein, is important for overall nutrition but is not a specific intervention for managing JIA.

4. What is the primary goal in managing a child with asthma?

Correct answer: B

Rationale: The primary goal in managing a child with asthma is to avoid triggering asthma attacks. This involves managing allergens, ensuring proper medication use, and creating an asthma action plan. Choice A is incorrect because the goal is to avoid triggering asthma attacks, not necessarily to prevent recurrent infections. Choice C is incorrect as corticosteroids are a treatment option but not the primary goal of asthma management. Choice D is incorrect because although physical activity is important, the primary goal is to prevent asthma attacks and manage symptoms effectively.

5. What should be a priority for a 4-year-old child with nephrosis?

Correct answer: B

Rationale: The correct answer is B: Skin impairment. Skin care is a priority in nephrosis due to edema and increased risk of skin breakdown, requiring careful monitoring and management. While impaired body image (Choice A) can be a concern, it is not typically a priority in a 4-year-old with nephrosis. Nutritional deficit (Choice C) is important but addressing skin impairment takes precedence due to the immediate risk of complications related to skin breakdown. Injury (Choice D) is a general concern for children but is not the priority in a child with nephrosis.

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