Performing a Wilcoxon Rank Sum Test in Nonparametric Statistics, Example 186

In this video, we demonstrate how to perform the Wilcoxon Rank Sum Test, which is a nonparametric replacement for the independent t test.

[akontia]

One of the best, most simplified videos for Wilcox. Thank you!

[jobadebayoolaoti]

Excellent! In fact you are a born teacher. Kudos Sir.

[aravindssingapore]

And thank you for sharing your knowledge with the world 🌍

[vanessaelskamp]

thank you for sharing you knowledge. it did help me. I was a bit confused on the rangnumbers because my teacher explained it a bit vague.

[aravindssingapore]

Hallo, Mr. McGukian. This video is a very good learning resource. By the way your good name is very interesting too. It seems like the perfect way to phrase an invitation to dinner to someone, because "Dane McGukian" sounds like "Dine, my cooking!"

[Sero-]

Thank u very much kind Sir, u rescued me !

[thatomothoagae]

how do you calculate p value when you are given T(+), T(-) and n?

[aravindssingapore]

I often mishear "Wilcoxon Rank Sum Test" as "Wisconsin, raise some glass!" 🥂🍻

[saramarim]

Thanks for the amazing video. I was a little confused at the end though. I thought the test statistic was 104 not 106. Could anyone explain why in the end we checked if 106 fit between TL and TU instead of 104?

[burculuks]

Hello, thanks for the clear video.
I just had a question; you used the sum of the ranks as the test statistic, in my lectures I have to use U as the test statistic, whereby U1 = n1*n2 + n1*(n1+1)/2 - sum of rank1 and U2 = n1*n2 + n2*(n2+1)/2 - sum of rank2.
I'm just a little confused by this, since you did it differently.

[rebeccariehl]

OMG You are an angel!!!! Thank you!!1!

[Ilemaurice]

Hello sir plz what this question The urinary fluoride concentration (parts per million) was measured for a sample

of livestock grazing in an area previously exposed to fluoride pollution and the

measurements are provided:


25.8 36.6 26.3 21.8 27.2

Does the data indicate strongly that the true average fluoride concentration for

livestock grazing in the polluted region exceeds 25? Test at 5% level of

significance using

i. the t-test.

ii. the Wilcoxon signed-rank test.


Specify the assumptions required for each test.

[akifaunissa]

When i use normal method of U1n U2 I got same result that is Ho is accepted .can we use the normal method for the independent one or the methods differ 🤔Iam confused

[fishertech]

Hey, lets say T1 and T2 were 104 and 78 and had the same sample size. Then you use the table to find the critical values and find that if you use T1 you do not reject Ho and if you use T2 as test stat you do reject Ho. What happens then?

[PW-qigi]

What happens if the same number appears in the first and the second sample? Can I number them alternately?

[ohhrelingo]

Excusme sir please the normal test for Wilcoxon ranked test the n that we gonna use it is it the original n that given in the problem or the n= number of positive signs + number of negative signs? That we gonna substitute it in the formula which is Z=

[gregoryoruko]

Can we get the table you used please 12:01

[yibeltalayitenew]

please attaché to my email address any supportive material (text book of nonparametric ) please

[elvinbarasa]

come for my degree in three years time