Which of the statements is true, relative to error? (Select all that apply.)
a. True score plus error score equals observed score.
b. Random error of measurement increases the mean.
c. The mean of the true measurements is equal to the mean of the observed measurements when there is no systematic error.
d. No measurement of anything is ever correct.
e. Measurement error always exists, if a straightforward measurement like counting is made often enough and by enough people.
ANS: A, C, E
Observed score = true score + random error. Random error does not influence the mean to be higher or lower but, rather, increases the amount of unexplained variance around the mean. Measurement error is the difference between what exists in reality and what is measured by an instrument.
You might also like to view...
What percentage of an adult's body weight consists of water?
a. 10% to 20% b. 30% to 40% c. 50% to 60% d. 70% to 80%
A nursing student has just completed the examination of an assigned patient and approaches the instructor to discuss the results
The student tells the instructor that the patient said he has been experiencing fatigue when mowing the lawn or when climbing the stairs. The nursing instructor asks the student, "What source data has the client's statement provided you?" The instructor is attempting to determine if the student understands which of the following? a. Objective data c. Supplemental data b. Subjective data d. Testable data
According to Ayurveda, all foods have their own heating or cooling energy and postdigestive effect
Indicate whether the statement is true or false
Which contributes to the regulation of hematopoiesis?
A. White bone marrow B. Hematopoietic stem cells C. Hormones D. Essential vitamins and nutrients