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Assignment 3 – Validity of research design
Read pages 171-179 on Internal and External Validity. Internal and external validity refer to
how the researcher controlled extraneous variables and whether the sample is generalizable to
the population. The textbook gives several common threats to internal and external validity (p.
171-177).
When critiquing an experimental research study, it’s important to be able to identify the
extraneous variables and state how the researchers controlled for these variables. It’s also
important to identify the threats to validity that the researcher could not control for.There are
additional articles on controlling for internal and external validity in the Objectives, Reading,
and Resources and several YouTube videos.
The authors should also comment on the validity and reliability of the data collection
instruments. This is explained on pages 304-307 in your textbook. This issue could be
considered a subset of the threat to validity called Instrumentation (p. 173).
Write a 1 to 1-1/2 paper answering questions 1, 2, 3, 4, and 5 on page 348 in the Internal and
External Validity” section. Intervention fidelity is explained on page 168.
You can use the article: (Braden, R., Reichow, S., & Halm, M. A. (2009). The use of the
essential oil lavandin to reduce preoperative anxiety in surgical patients. Journal Of
Perianesthesia Nursing, 24(6), 348-355. doi:10.1016/j.jopan.2009.10.002)
Use APA formatting for the Reference list and use double-spacing, 1inch margins, and Times
New Roman, size 12 font. You don’t need to use a running header or a title page.
Validity of research design
Read pages 171-179 on Internal and External Validity. Internal and external validity refer to
how the researcher controlled extraneous variables and whether the sample is generalizable to
the population. The textbook gives several common threats to internal and external validity (p.
171-177).
When critiquing an experimental research study, it’s important to be able to identify the
extraneous variables and state how the researchers controlled for these variables. It’s also
important to identify the threats to validity that the researcher could not control for.There are
additional articles on controlling for internal and external validity in the Objectives, Reading,
and Resources and several YouTube videos.
The authors should also comment on the validity and reliability of the data collection
instruments. This is explained on pages 304-307 in your textbook. This issue could be
considered a subset of the threat to validity called Instrumentation (p. 173).
Write a 1 to 1-1/2 paper answering questions 1, 2, 3, 4, and 5 on page 348 in the Internal and
External Validity” section. Intervention fidelity is explained on page 168.
You can use the article: (Braden, R., Reichow, S., & Halm, M. A. (2009). The use of the
essential oil lavandin to reduce preoperative anxiety in surgical patients. Journal Of
Perianesthesia Nursing, 24(6), 348-355. doi:10.1016/j.jopan.2009.10.002)
Use APA formatting for the Reference list and use double-spacing, 1inch margins, and Times
New Roman, size 12 font. You don’t need to use a running header or a title page.

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