A market researcher at a major clothing company that has traditionally relied on
ID: 3149391 • Letter: A
Question
A market researcher at a major clothing company that has traditionally relied on catalog mail-order sales decides to investigate whether the amount of monthly online sales has changed. She compares the mean monthly online sales of the past several months with a historical figure for mean monthly sales for online purchases. She gets a P-value of 0.01 Explain in this context what the 1% means. What does the 1% P-value mean? Online purchases make up 1% of all sales. The resulting mean sales would not occur assuming the historical mean for sales. If the mean monthly sales due to online purchases has changed, there is a 1% chance (or 1 out of every 100 samples) that the resulting mean sales would not occur assuming the historical mean for sales. If the mean monthly sales due to online purchases has not changed, there is a 1% chance (or 1 out of every 100 samples) that the resulting mean sales would occur assuming the historical mean for sales. Online purchases make up 1% of all sales. Because the percentage of online sales is so small, the resulting mean is insignificant.Explanation / Answer
P-values are the probability of obtaining an effect at least as extreme as the one in your sample data, assuming the truth of the null hypothesis.
For example, suppose that a vaccine study produced a P value of 0.04. This P value indicates that if the vaccine had no effect, you’d obtain the observed difference or more in 4% of studies due to random sampling error.
P values address only one question: how likely are your data, assuming a true null hypothesis? It does not measure support for the alternative hypothesis.
Assuming the truth of the null hypothesis, we get mean has not chenged, and there is 1% chance for sample mean to occur.
So,option C is correct.
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