A. If the researchers had chosen to measure stress physiologically instead of via questionnaire (not in addition to a questionnaire), what would the impact of that choice be? Answer T/F for each statement, then explain whatever answer you selected. 1. A physiological measurement of participants’ BMI (body mass index) would provide better construct validity. 2. If participants’ health was controlled for in the study, physiological measurement would result in better internal validity than responses to the questionnaire. 3. Physiological measurements are likely to be less efficient than questionnaires. B. If the mindfulness reminders were sent at the same time each day, which type of validity is being maximized, internal or external? Why? C. If the mindfulness reminders were sent randomly each day, which type of validity is being maximized, internal or external? Why?
Read the scenario below describing a research study, then answer the questions concerning its claims, variables, and design.
Psychologists wanted to examine whether practicing mindfulness reduces students’ stress levels. In their study, participants watched a short video explaining mindfulness and telling them how to spend a 3-minute period in a “mindfulness moment.” Each day for 7 days after watching the video, participants received a text alert from the researcher asking them to complete a 3-min mindfulness moment. Before watching the initial video and after their 7th day of mindfulness practice, students completed a stress rating questionnaire reflecting how stressed they felt generally and in the present moment. Researchers then tested whether reported stress levels were lower at the end of the study than they were at the beginning.
A. If the researchers had chosen to measure stress physiologically instead of via questionnaire (not in addition to a questionnaire), what would the impact of that choice be? Answer T/F for each statement, then explain whatever answer you selected.
1. A physiological measurement of participants’ BMI (body mass index) would provide better construct validity.
2. If participants’ health was controlled for in the study, physiological measurement would result in better internal validity than responses to the questionnaire.
3. Physiological measurements are likely to be less efficient than questionnaires.
B. If the mindfulness reminders were sent at the same time each day, which type of validity is being maximized, internal or external? Why?
C. If the mindfulness reminders were sent randomly each day, which type of validity is being maximized, internal or external? Why?
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