How much must two means differ before we can consider the difference "real" and not due to chance? To answer this question,we must use
A) coefficients of correlation.
B) tests of statistical significance.
C) graphical statistics.
D) random selection.

Question

Quizplus · Accepted Answer

Tests of statistical significance are used to determine the likelihood that the observed difference between two means is due to chance. These tests provide a p-value which indicates the probability of observing a difference as large as the one observed, assuming that there is no real difference between the means. If the p-value is below a certain threshold (usually 0.05), we reject the null hypothesis of no difference and conclude that the difference is statistically significant.

How Much Must Two Means Differ Before We Can Consider