From a population of cans of coffee marked "12 ounces," a sample of 25 cans is selected and the contents of each can are weighed. The sample revealed a mean of 11.8 ounces and a standard deviation of 0.5 ounces. Test to see if the mean of the population is at least 12 ounces. (Assume the population is normally distributed.) Use a .05 level of significance
H0: ? ? 12
Ha: ? < 12 t = –2; therefore, reject H0 . There is sufficient evidence at ? = .05 to conclude that the population mean amount of coffee is less than 12 ounces.
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