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OpenStudy (lilday12):
A building manager installs sensors to see how often people turn of the lights when they leave a room. After a month the manager has sample size of 400, a sample mean of 47%, and a sample standard deviation of 4%. What is the confidence level for a confidence interval of 46.6% to 47.4%? A. 99.7% B. 85% C. 68% D. 95%
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