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OpenStudy (anonymous):
The weight of the average 18-year-old male is 163.5 pounds with a standard deviation of 10.5 pounds. Which of the following statements is true with a 95% confidence? When I did this, I got 132 and 195 pounds.
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OpenStudy (anonymous):
Oh wait. It should be 142.5 and 184.5, right?
OpenStudy (amistre64):
95% is most accuratly defined as a z score of 1.96; the emipirical rule is an approximation of 2 \[95\% \approx 163.5\pm2(10.5)\] \[95\% = 163.5\pm1.96(10.5)\]
OpenStudy (amistre64):
the 184.5 is good
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