ISDS CH.8 Study Guide Test.
ISDS CH.8 Study Guide Test. Why is it not possible to have 100% confidence? Explain - CORRECT ANSWER A 100% confidence interval is not possible unless either the entire population is sampled or an absurdly wide interval of estimates is provided A 90 confidence interval estimate for the population mean paper length is 10.9957110.99571less than or equals≤muμless than or equals≤11.0022911.00229. Is it true that you do not know for sure whether the population mean is between 10.9957110.99571 and 11.0022911.00229 inches? Explain - CORRECT ANSWER It is true because the population mean will be in the interval only 9090% of the time. A market researcher selects a simple random sample of nequals=100 users of a social media website from a population of over 100 million registered users. After analyzing the sample, she states that she has 95% confidence that the mean time spent on the site per day is between 15 and 57 minutes. Explain the meaning of this statement - CORRECT ANSWER One is 95% confident that the true mean time all registered users spend on the site per day is between 15 and 57 minutes.
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