Which of the following inferential statistical methods would be used to determine if there is a significant difference between the means of two groups?

A p-value is a probability value that helps determine the significance of the results of a statistical test, but it is not a test itself for comparing means.

A Z-score measures how many standard deviations an element is from the mean, typically used for individual data points in a known population, not for comparing means of two groups.

A Chi-squared test is used to determine if there is a significant association between two categorical variables, not for comparing the means of two numerical groups.

A t-test is a statistical hypothesis test used to determine if there is a significant difference between the means of two groups, especially when the variances of the two populations are unknown or the sample sizes are small. It calculates a t-statistic and uses it to find a p-value to assess the significance of the difference.