A researcher sampled 20 people who volunteered to pick up trash on the beach. The volunteers filled out a personality survey, and the researcher hypothesized that the volunteers would score higher on the trait agreeableness than the general population. The mean for agreeableness in the general population is considered to be 3, while the sample of volunteers scored a 3.21 (SD = 1.94). Calculate the t-statistic for a one sample t-test. Round your answer to two decimal places.