Which of the designs below would be best suited to ANCOVA? a. Participants were randomly allocated...
Which of the designs below would be best suited to ANCOVA?
| a. |
Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. The researcher was interested in the relationship between the therapist’s ratings of improvement and stress levels over a 3-month treatment period. |
|
| b. |
Participants were allocated to one of two stress management therapy groups, or a waiting list control group based on their baseline levels of stress. The researcher was interested in investigating whether stress after the therapy was successful partialling out their baseline anxiety. |
|
| c. |
Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. Their baseline levels of stress were measured before treatment, and again after 3 months of weekly therapy sessions. |
|
| d. |
Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. Their levels of stress were measured and compared after 3 months of weekly therapy sessions. |
Homework Answers
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Which of the designs below would be best suited to ANCOVA?
a.
Participants were randomly allocated...
contrasting a repeated measures research design with matched subjects and independent measures designs A graduate student...
contrasting a repeated measures research design with matched
subjects and independent measures designs
A graduate student is interested in whether journaling can affect grief and healing. She has participants who have been widowed within the past 10-14 months complete a battery of psychological questionnaires before and after journaling about their daily problems for 2 months. The first time the graduate student conducted this study, she used a repeated-measures design and compared the widows' and widowers' baseline scores with their scores...
Subject bias can occur in an experiment when the participants are aware of the purpose of...
Subject bias can occur in an experiment when the participants are aware of the purpose of the study and respond in a way that they think the researchers want. For example, if participants believe they are in a study to test if coffee improves your mood, those who drank coffee might claim to be happier than they really are. Based on the information given, which of the following experiments is most likely to have the issue of a control or...
In this study, participants were randomly assigned to one of two situations – “stress” or “no...
In this study, participants were randomly assigned to one of two situations – “stress” or “no stress”. They were then put into their assigned fictitious situation and after an hour, were asked to provide an appetite score (Likert-rating). The following data are appetite scores (with higher indicating more of an appetite / i.e. the person is hungry) from 24 participants. Assume data meets all assumptions for a parametric test. Using the information provided, create an SPSS data file and conduct...
Select one answer. In which one of the following situations would it be most appropriate to...
Select one answer. In which one of the following situations would it be most appropriate to use an ANOVA to analyze the data? 10 points A. О A professor is interested in whether a research mentoring program can help students gain admission to graduate school. She randomly assigns 90 students who plan to apply to graduate school to one of three groups: (1) a one-semester research mentoring program, (2) a two-semester research mentoring program, or (3) no mentoring program. She...
Need help please show work 12 Table 4.4 shows results from the study of diabetic patients...
Need help please show work
12 Table 4.4 shows results from the study of diabetic patients discussed in Goldman and Smith (2002). Recall that three groups of patients separated by education level were treated with one of two therapies (conventional vs. intensive). Their average hemoglobin Alc levels (also known as glycosylated hemoglobin) before and after the experiment are reported. Note that, as in golf, lower scores are better on the hemoglobin Alc test, which measures how well the patient has...
Question 12 0 pts Suppose a hypertension trial is mounted and 18 participants are randomly assigned...
Question 12 0 pts Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments so that each treatment group has 6 participants. Each participant takes the assigned medication and their systolic blood pressure (SBP) is recorded after 6 months on the assigned treatment. The ANOVA table is as follows (You should be able to figure out values in the numbered cells): Source Between-Group 2376.8 Within-Group 846.2 Total Sum of Squares df Mean...
1. The pretest-posttest nonequivalent control group design is also very commonly used in psychology. Which of...
1. The pretest-posttest nonequivalent control group design is also very commonly used in psychology. Which of the following is NOT a benefit of using this design when random assignment is not possible: It reduces the threat of assignment bias It limits threats from time-related factors It provides some evidence of a potential cause-effect relationship It rules out differential history effects 2. Particularly when they do not include a control group, pre-post designs are most vulnerable to ____________-related threats to internal...
1. The pretest-posttest nonequivalent control group design is also very commonly used in psychology. Which of the following is NOT a benefit of using this design when random assignment is not possible...
1. The pretest-posttest nonequivalent control group design is also very commonly used in psychology. Which of the following is NOT a benefit of using this design when random assignment is not possible: It reduces the threat of assignment bias It limits threats from time-related factors It provides some evidence of a potential cause-effect relationship It rules out differential history effects 2. Particularly when they do not include a control group, pre-post designs are most vulnerable to ____________-related threats to internal...
2) In a different study, patients were divided randomly into two groups. One group received a...
2) In a different study, patients were divided randomly into two groups. One group received a well-known migraine headache medication called Maxalt, while another group received nothing. On average, there was a 40% decrease in pain levels after 2 hours for the group receiving Maxalt. The group who received nothing had a 15% decrease in pain. Part A: The patients were divided randomly, so the groups should be roughly similar. Unfortunately, there is still a confounding variable in this study....
1.Given an interval or ratio scale dependent variable and a nominal independent variable with three or...
1.Given an interval or ratio scale dependent variable and a nominal independent variable with three or more levels, we could use a(n) ________ to analyze the data. Select one: A. t test B. ANOVA C. z test D. PRE test 2. Interested in the effects of different kinds of instruction on videogame performance, Martin asks 30 college freshmen to each play an hour of Ratchet and Klank. Participants are randomly assigned to one of three instruction groups: (1) complete the...
contrasting a repeated measures research design with matched
subjects and independent measures designs
A graduate student is interested in whether journaling can affect grief and healing. She has participants who have been widowed within the past 10-14 months complete a battery of psychological questionnaires before and after journaling about their daily problems for 2 months. The first time the graduate student conducted this study, she used a repeated-measures design and compared the widows' and widowers' baseline scores with their scores...
Select one answer. In which one of the following situations would it be most appropriate to use an ANOVA to analyze the data? 10 points A. О A professor is interested in whether a research mentoring program can help students gain admission to graduate school. She randomly assigns 90 students who plan to apply to graduate school to one of three groups: (1) a one-semester research mentoring program, (2) a two-semester research mentoring program, or (3) no mentoring program. She...
Need help please show work
12 Table 4.4 shows results from the study of diabetic patients discussed in Goldman and Smith (2002). Recall that three groups of patients separated by education level were treated with one of two therapies (conventional vs. intensive). Their average hemoglobin Alc levels (also known as glycosylated hemoglobin) before and after the experiment are reported. Note that, as in golf, lower scores are better on the hemoglobin Alc test, which measures how well the patient has...
Question 12 0 pts Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments so that each treatment group has 6 participants. Each participant takes the assigned medication and their systolic blood pressure (SBP) is recorded after 6 months on the assigned treatment. The ANOVA table is as follows (You should be able to figure out values in the numbered cells): Source Between-Group 2376.8 Within-Group 846.2 Total Sum of Squares df Mean...
2) In a different study, patients were divided randomly into two groups. One group received a well-known migraine headache medication called Maxalt, while another group received nothing. On average, there was a 40% decrease in pain levels after 2 hours for the group receiving Maxalt. The group who received nothing had a 15% decrease in pain. Part A: The patients were divided randomly, so the groups should be roughly similar. Unfortunately, there is still a confounding variable in this study....
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