A Type of Sampling (Independent or Paired), Sample Size(s), and a Figure

A type of sampling (independent or paired) , sample size(s) , and a figure showing the results of preliminary data analyseson the sample(s) are provided. The intent is to employ the sample data to perform a hypothesis test to compare the meansof the two populations from which the data were obtained. Use the information provided to decide which procedureshould be applied.
-Independent; $\mathrm { n } _ { 1 } = 12$ and $\mathrm { n } _ { 2 } = 12$ . A normal probability plot for each sample and a back-to-back stem-and-leaf diagram are given below.


$\begin{array} { r | l | l } & 2 & 4 \\75 & 3 & \\632 & 4 & 2 \\5 & 5 & 25 \\2 & 6 & 057 \\752 & 7 & 12579 \\72 & 8 &\end{array}$

A) Paired Wilcoxon signed-rank test
B) Mann-Whitney test
C) Consult a statistician
D) Pooled t-test

Correct Answer:

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