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Brady hypothesized that inadequate social support among the elderly results in a high level of chronic health problems and low morale. She tested this hypothesis by interviewing a sample of 250 residents of a community who were aged 65 years and older. The participants were randomly selected from a list of town residents. Brady 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, whether they belonged to any clubs or social groups). Based on responses to the various questions on social support, participants were classified in one of three groups: low social support, moderate social support, and high social support. In a 6-month follow-up interview, Brady collected information from 214 of the participants about the frequency, type, and intensity of the respondents illnesses in the preceding 6 months, hospitalizations during that period, and their overall satisfaction with life. The data analysis revealed that participants in the low-support group had significantly more health problems and hospitalizations and lower life satisfaction ratings than those in the other two groups. Brady concluded that the availability of social supports resulted in better physical health and emotional adjustment in the elderly. What type of study is this research?
Recurrence is defined as the reappearance of a metastasis in exactly the same site, or in the case of patients whose tumor never completely disappeared, enlargement of the original lesion. Times to recurrence (in weeks) for the 23 patients were: 2..
If the company wants 99% of all bags to have at least 5 kg as printed on the bag, what mean amount should the injection machine be set to put in each bag?
Simulate the birthday problem to find the first person with the same birthday as yours. Perform the simulation 500 times. How many people did it take to find the first match? Was it typically about the same as the theoretical expected value?
An English professor is attempting to estimate the mean number of novels that the student body reads during their time in college.
Biology and Environmental Science The moisture content in bulk grain is important, because high values can encourage the development of fungi.
How many bulls-eyes do you expect her to get?- With what standard deviation?- If she keeps shooting arrows until she hits the bull s-eye, how long do you expect it will take?
A statistician has a sample, and is computing the sum of the squared deviations of the sample numbers from a number q. The sum of the squared deviations will be smallest when q is the __________. Fill in the blank (25 words or less) and explain.
Several samples of size 56 are randomly selected and means computed. What value would you expect to determine for standard deviation of all these sample means?
What is meant by the term "national interest," and what are the dangers of using national interest as a rationale for nation-state behavior?
What is the difference between probable cause and reasonable suspicion?
why is it important that a sample be random? for its validity all hypothesis testing depends heavily on the assumption
Dertermine the probability that a male is a Major or a Colonel?
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