The U S Senate has 100 members Information was obtained from
The U.S. Senate has 100 members. Information was obtained from the individuals responsible for managing correspondence in 61 senators' offices. Of these, 38 specified a minimum number of letters that must be received on an issue before a form letter in response is created.
a. Assume these observations constitute a random sample from the population, and find a 90% confidence interval for the proportion of all senators' offices with this policy.
b. In fact, information was not obtained from a random sample of senate offices. Questionnaires were sent to all 100 offices, but only 61 responded. How does this information influence your view of the answer to part (a)?
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