Rye County Hospital\'s Wellness Center is testing two programs to get smokers to
ID: 3502746 • Letter: R
Question
Rye County Hospital's Wellness Center is testing two programs to get smokers to quit STOP is offered on Tuesday nights and QUIT is offered on Thursday nights. Ninety smok- ers volunteered to be subjects. They will be randomly assigned to STOP, QUIT, or No Treatment (neither group). What two threats to internal validity are controlled by random assignment? About the time the smoking study started, cigarette taxes increased sharply. Would this affect the internal validity of the study? Justify your answer. a b c Several subjects assigned to QUIT had a schedule conflict with their aerobics class. Before the program began, a secretary let them trade places with subjects assigned to STOP. Comment on how the secretary's action probably affected the study's internal validity STOP and QUIT begin and end in the same week. At the last session of the STOP program, data on the subjects' smoking behavior were gathered. The analysts forgot to gather the same data from the QUIT subjects. Three weeks later the oversight was discovered, and the data were collected. Comment on how the oversight may have affected the study's internal validity What is the value of having a No Treatment group? d eExplanation / Answer
A. Random assignment controls selection bias and maturity as threats to internal validity. The participant groups formed by full power of random assignment are equal within the limits of random error, before and after the treatment begins.
B. There is a good chance that the sharp increase in the cost of cigarettes affect the internal validity of the study. This refers to the impact of history or events outside of the study or between repeated measures of the dependent variable that may affect participants' responses.
C. This act may result in two types of threats to internal validity. Diffusion maybe observed as the treatment effects can spread from treatment groups to control groups. Furthermore, there can also be compensatory rivalry or resentful demoralization because of which behavior in the control groups may be altered.
D. Here, instrumentation seems to have occured. This refers to threats that occur due to changes in the assessment of the dependent variable. It is likely that participants from the QUIT group may have forgotten something it undergone external changes in 3 weeks.
Please post the other questions separately as we are supposed to answer just one question or four sub parts of the same question.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.