A
Anton S
Guest
Please suggest me what Method I should use for this question.
I think its either Wilcoxon signed-rank test or Mann-Whitney-Wilcoxon test(MWW), but I can't decide which fits best for the question.
Please tell which one should be used, and what is the reason of chosing that, rather than the other one.
Thank you.
Question 1(a)
A famous footballer has been sponsored by a hair gel manufacturer to have his name associated with their product. However he has recently had a change of hairstyle which no longer requires the use of a hair gel. The manufacturer is therefore considering withdrawal of their sponsorship, but the footballer’s agent is arguing that this latest stunt has in fact further heightened consumers’ awareness of their product. Data collected on monthly sales of the hair gel in 20 different outlets, 10 before the change of hairstyle and 10 after before the change of hairstyle is shown below:
Monthly Sales (£’000)
Before 22.5 15 13 23 25 24.5 21 18.5 22 17.5
After 27 16.5 17 28.5 30.5 20 27.5 23.5 18 17
You should assume that a preliminary analysis of this data has shown that it does NOT have a Normal distribution.
Is there any evidence that this latest stunt has led to a significant increase in sales?
I think its either Wilcoxon signed-rank test or Mann-Whitney-Wilcoxon test(MWW), but I can't decide which fits best for the question.
Please tell which one should be used, and what is the reason of chosing that, rather than the other one.
Thank you.
Question 1(a)
A famous footballer has been sponsored by a hair gel manufacturer to have his name associated with their product. However he has recently had a change of hairstyle which no longer requires the use of a hair gel. The manufacturer is therefore considering withdrawal of their sponsorship, but the footballer’s agent is arguing that this latest stunt has in fact further heightened consumers’ awareness of their product. Data collected on monthly sales of the hair gel in 20 different outlets, 10 before the change of hairstyle and 10 after before the change of hairstyle is shown below:
Monthly Sales (£’000)
Before 22.5 15 13 23 25 24.5 21 18.5 22 17.5
After 27 16.5 17 28.5 30.5 20 27.5 23.5 18 17
You should assume that a preliminary analysis of this data has shown that it does NOT have a Normal distribution.
Is there any evidence that this latest stunt has led to a significant increase in sales?