а 21. Dogs Canine hip dysplasia is a degenerative disease that causes pain in many dogs. Sometimes advanced warning sign

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а 21. Dogs Canine hip dysplasia is a degenerative disease that causes pain in many dogs. Sometimes advanced warning signs appear in puppies as young as 6 months. A veterinarian checked 42 puppies whose owners brought them to a vac- cination clinic, and she found 5 with early hip dysplasia. She considers this group to be a random sample of all puppies. a) Explain we cannot use this information to construct a confidence interval for the rate of occurrence of early hip dysplasia among all 6-month-old puppies. *b) Construct a “plus-four" confidence interval and inter- pret it in this context.