A researcher concludes that stress levels are higher following a major versus a minor traffic accident (95% confidence interval [CI] 1.86-3.02).If the null hypothesis stated that there would be no difference (null hypothesis: µ = 0),then what is the effect size for this confidence interval?
A)Between 1.86% and 3.02% of the variability in stress levels can be accounted for by type of traffic accident.
B)Ratings of stress shifted more than 1.86 points in the population.
C)Ratings of stress shifted between 1.86 and 3.02 points in the population.
D)There is not enough information to answer this question.

Question

Quizplus · Accepted Answer

The effect size for this confidence interval is the range between the upper and lower bounds of the CI, which is 1.86-3.02 points. Therefore, the ratings of stress shifted between 1.86 and 3.02 points in the population. Choice A is incorrect because the variability cannot be expressed as a percentage in this context. Choice B is incorrect because it doesn't accurately reflect the effect size of the confidence interval. Choice D is incorrect because there is enough information to calculate the effect size.

A Researcher Concludes That Stress Levels Are Higher Following a Major