The Medassist Pharmaceutical Company makes a pill intended for children susceptible to seizures. The pill is supposed to contain 20.0 mg of Phenobarbital. A random sample of 20 pills yielded the amounts (in milligrams) listed here. Are these pills acceptable at the α = 0.01 significance level?

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27.5 26.0 22.9 23.4 23.0 23.9 32.6 20.9 22.9 24.3 24.8 16.1 24.3 17.3 18.9 20.7 33.0 15.6 24.3 23.3