A two-tailed t-test of the hypothesis that the population mean differs from zero has a p-value of 0.0275. Using a significance level of 5%, the most appropriate conclusion is:
The p-value is the smallest level of significance at which the null hypothesis can be rejected. In this case, the given p-value (0.0275) is less than the given level of significance (0.05); therefore, the null hypothesis is rejected.