Some research suggests that ambient scenting with peppermint essential oil can enhance cognitive focus and reduce errors. To investigate this further, an occupational psychologist wants to conduct an experiment to study the effect of dispersing peppermint essential oil into the workspace on the monthly data-entry error rates of administrative assistants working at a medical billing company called 'MedScribe Services' which has a total of 75 employees aged between 18 and 62.
Write a null hypothesis for this study.
