Question

During an experiment, readings for blood pressure in a person’s body were found to be constant. However, when measured by a different blood pressure cuff, the readings differed by 15 points for each reading. This difference indicates that the results are but not .

Answer 1

Answer:

Changing blood pressure can be caused by the body's response to small changes in daily life, such as stress, lack of sleep, exercise, and so on.

Explanation:

Blood pressure refers to the pressure experienced by blood in the arteries when blood is pumped by the heart to all members of the human body. Blood pressure is made by taking two measurements and is usually measured as follows - 120/80 mmHg. The top number (120) indicates the upward pressure of the arteries due to heart rate and is called systolic pressure. The bottom number (80) shows the pressure when the heart is resting between pumping and is called diastolic pressure. The best time to measure blood pressure is when you are resting and sitting or lying down.

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Answer 2

Answer:

The results are precise but not accurate

Explanation:

Precise readings are the ones which are close enough to the actual readings though they are never exactly the same.

Suppose if the reading obtained from instrument I were - 100, 90, 70 , 65

Then the readings from second instrument would be either 15 points more or less than the previous readings.

I.e (115, 85), (105, 75), (85, 55), (80, 50)

In the later case the readings obtained are close to themselves and are hence said to be precise.

But they are not similar to the readings taken by instrument I hence they are termed as not accurate.