Researchers conducted a study to investigate the relationship between caffeine consumption and alertness levels. They recruited 30 participants and assessed their alertness after consuming a caffeine-rich energy drink. The alertness ratings were recorded on a scale from 1 (very drowsy) to 10 (very alert). The sample statistics for the caffeine group mean is 7.8, the standard is 1.2 and size sample is 30. Using a significance level of =0.05, test whether the average alertness rating for the sample differs from the known average population alertness rating of 5 after consuming a caffeine-rich energy drink