Brush your teeth Th e amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean m and standard deviation s 5 20 seconds. Ricardo spends less than 60 seconds brushing his teeth about 40% of the time. Use this information to determine the mean of this distribution. Show your method clearly.

Nutrition Exam Review What is the scientific method and what are the steps involved What are the different types of research studies discussed in class, including pros/cons. Be able to identify examples. Know the definitions that pertain to experimental studies (ex. control group, randomized, etc). Scientific Method – how to get from a question to an answer - Observation and question - Hypothesis = unproven statement that tentatively explains relationships between 2 or more variables - Conduct research to collect data - Results and interpretations - Develop a theory = a tentative explanation that integrates many different findings to further understand and define topic Observational study - Epidemiological / observational study = study