A group of researchers developing an instrument performed a ...

[Jramos095]

A group of researchers developing an instrument performed a test-retest on the instrument with an interval of 5 days. This testing resulted in a correlation coefficient of 0.38. The nurse researcher interprets this as being indicative of what?
 
  a. Instrument is stable; high reliability
  b. Instrument is stable; low reliability
  c. Instrument is unstable; high reliability
  d. Instrument is unstable; low reliability

Question 2

A nurse researcher would want to use a Cronbach's alpha coefficient to establish the internal consistency of an instrument in which case?
 
  a. When questions are open-ended
  b. When questions/statements demand a yes or no response
  c. When the instrument uses a Likert-type response scale
  d. When the instrument is designed to measure more than one concept

[brittrenee]

Answer to Question 1

ANS: D

Feedback
A The low correlation coefficient reveals an unstable instrument and low reliability.
B The low correlation coefficient reveals an unstable instrument and low reliability.
C The low correlation coefficient reveals an unstable instrument and low reliability.
D The low correlation coefficient reveals an unstable instrument and low reliability.

Answer to Question 2

ANS: C

Feedback
A Open-ended questions elicit textual data that are content analyzed (qualitative analysis).
B KR-20 provides estimates of homogeneity used for instruments that have a dichotomous response format.
C Cronbach's alpha coefficient provides estimates of homogeneity when instruments are scaled with ordinal responses.
D Cronbach's alpha coefficient does not apply to this answer.