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)coefficents 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 probability that the difference observed between two means is due to chance or a real difference. The commonly used test is the t-test which provides a p-value indicating the probability of obtaining the observed difference by chance. Generally, a p-value less than 0.05 is considered statistically significant, meaning that the difference between the means is unlikely to be due to chance.

How Much Must Two Means Differ Before We Can Consider