A. a.4 and 6 b.5 c.17 d.6 and -11 *please choose the correct answer.* B A nonpar

Question

A.

a.4 and 6

b.5

c.17

d.6 and -11

*please choose the correct answer.*

B

A nonparametric test cannot be applied when the data are:

a.nominal.

b.ordinal.

c.interval.

d.ratio.

*please choose the correct answer.*

C

a.Reject the null hypothesis and conclude that the "after" is greater than "before."

b.Reject the null hypothesis and conclude that the "before" is greater than "after."

c.Fail to reject the null hypothesis.

d.Reject the null hypothesis and conclude that there is no difference between the "before" and "after."

*please choose the correct answer.*

Before After 10 12 10 18 19

Explanation / Answer

A. Sum of Ranks for before = 2 + 3.5 + 3.5 + 8 = 17

sum of ranks for After = 1 + 5 + 6 + 7 = 19

so U value will be minimum of these 2 = 17

B. Non parametric test cannot be applied to when data are in ratio type of data.

C. Here n = 7 and significance level = 0.05

and criritcal valueof U = 3

Here are the result details of the test

Result Details

Sample 1
Sum of ranks: 44
Mean of ranks: 6.29
Expected sum of ranks: 52.5
Expected mean of ranks: 7.5
U-value: 33
Expected U-value: 24.5

Sample 2
Sum of ranks: 61
Mean of ranks: 8.71
Expected sum of ranks: 52.5
Expected mean of ranks: 7.5
U-value: 16
Expected U-value: 24.5

Sample 1 & 2 Combined
Sum of ranks: 105
Mean of ranks: 7.5
Standard Deviation: 7.8262

The U-value is 16. The critical value of U at p < .05 is 3. Therefore, the result is not significant at p < .05.

so Option c is correct and we faile to reject the null hypothesis.

Before Rank After Rank 35 1 50 2 39 3 39 4 36 5 45 8 26 6.5 38 9.5 30 6.5 29 11 36 9.5 33 12.5 45 12.5 44 14 Sum 44 61

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