Continuing your discussion from Question #1 thisweek. What will be your decision rule for deciding to accept or reject thenull? The decision rule is based on your critical value. Your critical valuecan be easily calculated in Excel. However you must first determine theconfidence level you want to test at. This is at the discretion of theresearcher based on the risk of accepting or rejecting the null in error. Thereare only three confidence levels used in research. These are 99%, 95%, and 90%.If you chose to test at a 90% confidence level this means that there is a 10%change that you could reject or accept the null in error. Therefore theprobability (a or alpha) is 0.10.
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