In an attempt to investigate the impact of an over-the-counter herbal nasal spray on mental alertness of infants, a researcher conducted a study. The study involved 18 infants who were given a standard dose of the nasal spray an hour before taking a mental alertness screening test. The average score of the infants in the sample was found to be M = 54 with a standard deviation of S = 8. Typically, mental alertness screening test scores for infants in the general population are normally distributed with a mean of = 60.

Is there a significant difference in screening test scores after the spray is administered? Conduct a two-tailed test with = .05. State your null hypothesis, make a decision, and provide an APA format statement explaining your results. Cohen's d can be calculated if required.