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Qualities of a Good Research Instrument

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Rodelo Magno

on 5 August 2015

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Transcript of Qualities of a Good Research Instrument

Qualities of a Good Research Instrument

Methods in Testing the Reliability of a Good Research Instrument

2. Reliability-

means the extent to which a research instrument is dependable, consistent, and stable (Meriam, 1975).


3 Qualities of a Good Research Instrument:
1. Validity –
means the degree to which a test or measuring instrument measures what it intends to measure.
Types of Validity
 Content Validity-
means the extent to which the content or topic of the test is truly representative of the content of the course.
 Concurrent Validity-
is the degree to which the test agrees or correlates with a criterion set up as an acceptable measure.
 Construct Validity-
is the extent to which the test measures a theoretical construct or trait.
 Predictive Validity-
as described by Aquino and Garcia (1974), is determined by showing how well predictions made from the test are confirmed by evidence gathered at some subsequent time.
 Test-retest method-

the same instrument is administered twice to same group of subjects and the correlation coefficient is determined.
 Parallel-forms method-

may be

administered to the group of subjects, and the paired observations correlated. In estimating reliability by the administration of parallel or equivalent forms of a test, criteria parallelism is required. The two forms of the test must be constructed so that the content, type of item, difficulty, instructions for administration, and many others are similar but not identical.
 Split-half method-

the test in this method may be administered once, but the test items are divided into two halves. The common procedure is to divide a test into odd and even items. The two halves of the test must be similar but not identical in content, number of items, difficulty, means and standard deviations.

 Internal-consistency method-

is used with psychological tests which consist of dichotomously scored items.
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