Author Question: Reliability could be established for a physiological instrument, such as an automatic blood pressure ... (Read 68 times)

RRMR · **on:** Jul 8, 2018

Reliability could be established for a physiological instrument, such as an automatic blood pressure (BP) cuff, by:

a. measuring pulse rate and BP.
b. recalibrating the equipment.
c. taking the BP in a different arm.
d. using another BP cuff to compare results.

Question 2

Which of the following alpha coefficients would be the lowest value you would accept in evaluating the reliability of a well-developed measurement tool?

a. .25
b. .50
c. .65
d. .80

IAPPLET · **Reply #1 on:** Jul 8, 2018

Answer to Question 1

ANS: C
Reliability is concerned with the consistency of the measurement technique. Recalibration of mechanical equipment is used in many physiological studies to maintain precision, one of the critical attributes of reliability.
Measuring the pulse rate would not help determine the reliability of the BP cuff. Reliability is concerned with the consistency of the measurement technique.
Measuring the BP in a different arm would not determine the reliability of the BP cuff because readings in different arms may be different physiologically.
Reliability is getting consistent results with the same instrument.

Answer to Question 2

ANS: D
A reliability of .80 is considered the lowest acceptable coefficient for a well-developed measurement tool.
A coefficient of .25 would be much too low. A reliability of .80 is considered the lowest acceptable coefficient for a well-developed measurement tool.
A coefficient of .50 would be too low to be acceptable. A reliability of .80 is considered the lowest acceptable coefficient for a well-developed measurement tool.
A coefficient of .65 would be too low to be acceptable. A reliability of .80 is considered the lowest acceptable coefficient for a well-developed measurement tool.