Introductory Statistics (2nd Edition)
Introductory Statistics (2nd Edition)
2nd Edition
ISBN: 9780321978271
Author: Robert Gould, Colleen N. Ryan
Publisher: PEARSON
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Chapter 12, Problem 11SE
To determine

Determine whether the given study is more likely to be a controlled experiment or an observational study.

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A study examined the relationship between a nurse's assessment of a patient's facial expression and his or her self-reported level of pain. Data for 89 patients are summarized below: Self-Report Facial Expression No Pain Pain No Pain 17 40 Pain 3 29 We'd like to determine if there is evidence of an association between a facial expression that reflects pain and self-report pain, because dementia patients do not always give a verbal indication that they are in pain. By using SPSS or Minitab, design the appropriate test and generate the data analyses. Relate the results of the test to the research question and conclude the findings.
Researchers studied a group of 30 “self-designated worriers” (i.e. individuals who reported spending at least 10% of the day worrying) and who were over the age of 70 (mean age of 78.1).  The researcher randomly assigned the worriers into three groups.  For the next four weeks, each group would experience a different approach to handling worry.  One group engaged in a worry-focus discussion group.  The second group members enjoyed individual therapy.  The third group went for daily walks in the park.  Data was collected, analyzed, and interpreted. 41.  The above design utilizes what type of group assignment technique:   a. mixed factorial with combined assignment (mixed combo).   b. repeated measures.   c. nonequivalent groups.   d. independent groups.   e. quota sampling.
Does the example represent an observational study or an​ experiment?   Car accident data is obtained from the Ohio database. It is found that more accidents happened at night.

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Introductory Statistics (2nd Edition)

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