An experimental researcher usually begins with the null hypothesis of no treatment effect. What does this researcher do when he finds that the probability level is less than the significance level?
An experimental researcher usually begins with the null hypothesis of no treatment effect. What does this researcher do when he finds that the probability level is less than the significance level?
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The null hypothesis is retained and tested one more time before a determination can be made about the effectiveness of the treatment
The alternative hypothesis (that there is a treatment effect) is said to be true, and the null hypothesis is discarded
The null hypothesis is rejected, and the alternative hypothesis (that there is a treatment effect) is tentatively accepted
The researcher designs another study to prove the null hypothesis
