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12.3 Siegel (1990) found that elderly people who owned dogs were less likely to pay visits to their doctors after upsetting events than were those who did not own pets. Similarly, consider the following hypothetical data. A sample of elderly dog owners is compared to a similar group (in terms of age and health) who do not own dogs. The researcher records the number of visits to the doctor during the past year for each person. The data are as follows: Dog Owners Control Group 11 7 6 9 12 8 7 4 7 3 7 a. Is there a significant difference in the number of doctor visits between dog owners and control subjects? Use a two-tailed test with a =.05. Note for problems 12.2 & 12.3 above: Be sure and show a full diagram of the research design. Also show all steps and calculations you made for each test following the process outlined in the t-test formula sheet handout. What statistical decision do you make in each case? Finally report your results professionally in APA format (see last step of the formula sheet for this module).

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