This topic contains a solution. Click here to go to the answer

Author Question: Which of the statements is true, relative to error? (Select all that apply.) a. True score plus ... (Read 177 times)

Marty

  • Hero Member
  • *****
  • Posts: 553
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.

Question 2

Tests of stability reliability, such as test-retest, can reveal random measurement error. Why is systematic measurement error not revealed when stability reliability determinations are made?
 
  a. Actually, reliability testing does not reveal the type of error: differences on test-retest can indicate problems with both random and systematic measurement error.
  b. Tests of stability reliability are not powerful enough to pick up systematic measurement error because of its subtlety.
  c. If an instrument systematically measures all blood pressures 10 points high, it will do so both at baseline and on retesting.
  d. The direction of the systematic measurement error is reversed on retesting, so it is not visible in the statistical analysis.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

apple

  • Sr. Member
  • ****
  • Posts: 352
Answer to Question 1

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.

Answer to Question 2

ANS: C
Stability reliability is concerned with the consistency of repeated measures of the same attribute with the use of the same scale or instrument over time. It is usually referred to as test-retest reliability. This measure of reliability is generally used with physical measures, technological measures, and paper-and-pencil scales. The technique requires an assumption that the factor to be measured remains the same at the two testing times and that any change in the value or score is a consequence of random error.




apple

  • Sr. Member
  • ****
  • Posts: 352

 

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Did you know?

More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

For a complete list of videos, visit our video library