There are several statistical tests that could be used to determine if there is a significant difference in concentration levels between the coffee and placebo groups. One common test is the t-test, which is used to compare the means of two groups. Specifically, the two-sample t-test would be appropriate in this case, since we have two independent groups (coffee and placebo) and we want to compare their means. The t-test calculates a t-value, which can be compared to a critical value to determine whether the difference in means is statistically significant. Another test that could be used is the ANOVA (analysis of variance) test, which can be used to compare means across three or more groups. However, since we only have two groups in this example, the t-test is likely the more appropriate choice.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence