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Lace and Janosy hypothesized that the absence of socioemotional supports among the elderly results in a high level of chronic health problems and low quality of life. They tested this hypothesis by interviewing a sample of 250 residents of one community who were aged 65 years and older. The participants were randomly selected from a list of town residents. The researchers asked a series of questions about the availability of socioemotional supports (e.g., whether the participants lived with any kin, whether they had any living children who resided within 30 minutes away). Based on responses to the various questions on social support, participants were classified into one of three groups: low social support, moderate social support, and high social support. In a 6-month follow-up interview, Lace and Janosy collected information from 214 of the participants about the frequency and intensity of the respondents’ illnesses in the preceding 6-months, their hospitalizations, and their overall quality of life. The data analysis revealed that participants in the low-support group had significantly more health problems and hospitalizations and lower quality of life ratings than those in the other two groups. The researchers concluded that the availability of social supports caused better physical and mental functioning in old age.
Discuss, to the extent possible based on this brief summary, the strengths and weaknesses of this study design with respect to internal validity and external validity. What are some of the key threats to the validity of this study?

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