When an observed difference between two groups on the dependent variable is attributed to the effect of the independent variable through statistical hypothesis testing, then we know that.
A)it is unlikely that the difference would occur by chance alone
B)the raw data have been refined
C)the groups were not equivalent before the independent variable was introduced
D)it is likely that the difference would occur by chance alone

Question

Quizplus · Accepted Answer

If the observed difference between the two groups on the dependent variable is statistically significant, then we can conclude that it is unlikely to have occurred by chance alone. This is the basis of statistical hypothesis testing, where we assume a null hypothesis (that there is no difference between the groups) and an alternative hypothesis (that there is a difference between the groups), and use statistical methods to determine the likelihood of obtaining the observed result if the null hypothesis is true. If the probability (p-value) of obtaining the observed result is very low (typically less than 0.05), we reject the null hypothesis and accept the alternative hypothesis, concluding that the observed difference is due to the effect of the independent variable. Therefore, option A is the best choice.

When an Observed Difference Between Two Groups on the Dependent