Explain the difference between assignment bias and selection bias. Which one is a threat to internal validity and which is a threat to external validity?
What will be an ideal response?
Selection bias means that the selection process produces a sample that is not representative of the population. Because the sample is not representative, it limits the ability to generalize the results from the sample which is a threat to external validity. Assignment bias occurs when the process used to assign different participants to different treatments produces groups of individuals with noticeably different characteristics. Assignment bias is a threat to internal validity because it allows an alternative explanation for any differences observed between the treatment conditions.
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Depression affects some 35% of people aged 65 and above.
Answer the following statement true (T) or false (F)
In general, what has been the effect of high-intensity physical exercise programs for the elderly?
a. These programs are linked to a greater incidence of heart attack. b. These programs can help older adults double or even triple their physical strength. c. These programs work well to build strength for people under the age of 75, but are dangerous for those in older age categories. d. Programs of high-intensity exercise have little impact on the elderly.
_______ is the most widely consumed drug in the United States
A) ?Marijuana B) ?Alcohol C) ?Cocaine D) ?Ecstasy
According to the text, what are possible selves?
What will be an ideal response?