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A pill is supposed to contain 22.3 mg. of Phenobarbital. A random sample of 40 pills yields a mean of 20.8 and standard deviation of
- A pill is supposed to contain 22.3 mg. of Phenobarbital. A random sample of 40 pills yields a mean of 20.8 and standard deviation of 0.92. Are these pills accepted at a 0.05 significance level?
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