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 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.

3. What is an important consideration when caring for a child with epilepsy?

Correct answer: A

Rationale: Adherence to prescribed anticonvulsant medication is crucial when caring for a child with epilepsy. It is essential for managing the condition effectively and reducing the frequency of seizures. Choice B is incorrect because exercise, when done safely and under supervision, can be beneficial for children with epilepsy by promoting overall health. Choice C is incorrect as social interactions are important for the child's emotional well-being and should not be limited. Choice D is incorrect as increasing dietary caffeine intake can potentially trigger seizures in some individuals with epilepsy.

4. What is an important aspect of the care plan for a child with eczema?

Correct answer: A

Rationale: The correct answer is A: Use of steroid creams. Steroid creams are commonly used in the management of eczema to reduce inflammation and itching, thus improving the skin condition and comfort of the child. Choice B, frequent antibiotic therapy, is incorrect as antibiotics are not typically used to treat eczema unless there is a secondary bacterial infection. Choice C, a high-protein diet, is not a specific recommendation for eczema treatment. Choice D, daily baths in hot water, is not recommended for eczema care as hot water can exacerbate the condition by drying out the skin.

5. What is an important nursing intervention for a child with a newly inserted central venous catheter?

Correct answer: A

Rationale: Regularly monitoring for signs of infection is a critical nursing intervention for a child with a newly inserted central venous catheter. This intervention is essential to detect any early signs of infection, such as redness, swelling, or drainage at the catheter site, which can lead to serious complications like sepsis. Administering intravenous fluids as ordered is important but not the most crucial intervention for a newly inserted central venous catheter. Restricting the child's movement is unnecessary unless specified by the healthcare provider. Performing daily dressing changes alone is not sufficient to ensure the catheter's integrity and the child's safety; monitoring for signs of infection is key.

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