Certified Pulmonary Function Technologist (CPFT) Practice Exam

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Study for the Certified Pulmonary Function Technologist Exam. Prepare with flashcards and multiple choice questions, each question with hints and explanations. Get exam-ready with confidence!

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If a standard deviation is 2 torr and you perform measurements with +/- 2 standard deviations, what is the calculation to determine the range?

2 + 2
2 / 2
2 X 2
2 - 2

The correct answer is: 2 X 2

To determine the range when using a standard deviation of 2 torr and measuring with +/- 2 standard deviations, you would first calculate the total variation from the mean. By using the concept of standard deviation, when you measure with +/- 2 standard deviations, you are capturing a total of 4 units of variance (2 above and 2 below the mean). Thus, the calculation involves adding the standard deviation to itself: 2 (the standard deviation) multiplied by 2 (the number of standard deviations), leading to a total range of 4 torr when considering both sides of the mean. This is essential for understanding the reliability and distribution of your measurements, which gives you a broader perspective of how your data may vary. The other calculations do not provide the correct context for determining the range of measurements based on the standard deviation. For example, simply adding or subtracting the standard deviation yields no relevant information about the total range, while dividing does not pertain to the context of calculating measurement spread or variation.