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OpenStudy (anonymous):
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 625, a sample mean of 47%, and a sample standard deviation of 5%. What is the confidence level for a confidence interval of 46.8% to 47.2%?
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OpenStudy (anonymous):
A. 85% B. 95% C. 68% D. 99.7%
OpenStudy (anonymous):
never mind its 68%
OpenStudy (anonymous):
Correct it is 68%!
OpenStudy (anonymous):
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