what conclusion can be drawn from a study with a null result

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Expert Solution

Solution:

A null result occurs when we fail to reject . This is commonly referred to as a non-significant result or n-s. There are two possible “realities” when the null is not rejected.
First, is the case where the null is true. If were true, the probability of failing to reject is .95.
When the null is true, it is unlikely to make a Type I error. Second, is the situation wherein is false but we fail to reject . This reflects the Type II error probability (1 - Power).
If the null is actually false, this probability is ideally about .20. This means that, given an ideal situation, when is false it will not be rejected 1 out of 5 times. This result does not convey statistical certainty.
It is likely that either is true or is false. Neither result is ruled unlikely. This differs sharply from situations wherein we can reject . When we reject , there is a comparatively small probability that we have made an error (i.e., Type I error rate of 5%).

orchestra answered 10 months ago

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