A researcher conducts a power analysis for a study in which there was no difference between control and experimental group scores and identifies a power level of 0.75 and a level of significance of 0.05.What will this researcher do?
A) Alter measurement methods to detect larger changes in scores.
B) Conclude that the null hypothesis is true.
C) Consider repeating the study using a larger sample.
D) Lower the level of significance to 0.01.

Question

Quizplus · Accepted Answer

The minimum acceptable power level is 0.80.To improve this,a larger sample size may be necessary.Because the level of power is too low,the researcher cannot draw valid conclusions about the data.Measurement methods that measure large changes decrease the effect size,which decreases the power.The level of significance does not indicate whether the null hypothesis is true or false,merely the probability of making an error in judging whether it is true or false.Lowering the level of significance lowers the power.

A Researcher Conducts a Power Analysis for a Study in Which