Expert answer:Reliabilty and validity worksheet.

Solved by verified expert:Please see attachment for assignment details.
psych655r4_reliability_and_validity_worksheet.doc

Unformatted Attachment Preview

Reliability and Validity Worksheet
PSYCH/655 Version 4
University of Phoenix Material
Reliability and Validity Worksheet
Instrument Reliability
A reliable instrument is one that is consistent in what it measures. If, for example, an individual scores
highly on the first administration of a test and if the test is reliable, he or she should score highly on a
second administration.
Imagine that you are conducting a study for which you must develop a test in mathematics for 7th-grade
students. You develop a 30-point test and distribute it to a class of 12, 7th-grade students. You then
administer the test again one month later to the day. The scores of the students on the two
administrations of the test are listed below. Use Microsoft® Excel® or IBM® SPSS® to create a scatterplot
with the provided scores, formatted as shown in the example graph. What observations can you make
about the reliability of this test? Explain.
A
B
C
D
E
F
G
H
I
J
K
L
30-POINT TEST
(FIRST ADMINISTRATION)
17
22
25
12
7
28
27
8
21
24
27
21
30-POINT TEST
(SECOND ADMINISTRATION)
15_______________
18_______________
21_______________
15_______________
14_______________
27_______________
24_______________
5_______________
25_______________
21_______________
27_______________
19_______________
Copyright © 2017, 2015, 2014 by University of Phoenix. All rights reserved.
1
Reliability and Validity Worksheet
PSYCH/655 Version 4
What Kind of Validity Evidence: Content-Related, Criterion-Related or Construct-Related?
A valid instrument is one that measures what it says it measures. Validity depends on the amount and
type of evidence there is to support one’s interpretations concerning data that has been collected. This
week, you discussed three kinds of evidence that can be collected regarding validity: content-related,
criterion-related, and construct-related evidence.
Each question below represents one of these three evidence types. In the space provided, write content if
the question refers to content-related evidence, criterion if the question related to criterion-related
evidence, and construct if the question refers to construct-related evidence of validity.
1. How strong is the relationship between the students’ scores obtained using this instrument and their
teacher’s rating of their ability?
2. How adequately do the questions in the instrument represent that which is being measured?
3. Do the items that the instrument contains logically reflect that which is being measured?
4. Are there a variety of different types of evidence (test scores, teacher ratings, correlations, etc.) that
all measure this variable?
5. How well do the scores obtained using this instrument predict future performance?
6. Is the format of the instrument appropriate?
Copyright © 2017, 2015, 2014 by University of Phoenix. All rights reserved.
2
…
Purchase answer to see full
attachment

How it works

1. Paste your instructions in the instructions box. You can also attach an instructions file
2. Select the writer category, deadline, education level and review the instructions 
3. Make a payment for the order to be assignment to a writer
4.  Download the paper after the writer uploads it 

Will the writer plagiarize my essay?

You will get a plagiarism-free paper and you can get an originality report upon request.

Is this service safe?

All the personal information is confidential and we have 100% safe payment methods. We also guarantee good grades