A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy,t(49)= 2.562,p

Question

A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy,t(49)= 2.562,p < .05.Use eta-squared to interpret the effect size for this result.
A)12% of the variability in marketing effectiveness can be accounted for by the new marketing strategy.
B)12% of the standard error can be accounted for by the effectiveness of the marketing strategy.
C)Marketing effectiveness shifted 0.12 standard deviations above the mean in the population.
D)both A and B are correct

Quizplus · Accepted Answer

Eta-squared is a measure of effect size that represents the proportion of variability in the dependent variable (sales) that can be explained by the independent variable (marketing strategy). Therefore, choice A is correct as it states that 12% of the variability in marketing effectiveness can be accounted for by the new marketing strategy. Choice B is incorrect as eta-squared does not pertain to the standard error. Choice C is incorrect as eta-squared does not measure the magnitude of the effect in standard deviation units. Finally, D is incorrect as only A is correct.

A Researcher Reports That the Effectiveness of a New Marketing