A Researcher Wants to Determine Whether the Means of Two $\quad$

question 2

Multiple Choice

A researcher wants to determine whether the means of two independent populations are the same.She has two independent random samples, one from each population, shown in the following table: $\quad$ $\quad$ $\quad$ $\quad$ Sample I $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ Sample II
$\begin{array}{llll|lllll}\hline 11.5 & 15.7 & 22.8 & 22.5 & 12.6 & 13.8 & 17.5 & 10.7 & 13.5 \\12.4 & 25.3 & 16.1 & 25.1 & 14.8 & 11.8 & 14.7 & 10.8 & 12.7\end{array}$

She uses the Mann-Whitney U test and a significance level of 0.05.This is a ______ test, and the critical ______.

• A)one-tailed; value is 1.96
• B)two-tailed; values are ±1.96
• C)one-tailed; value is 1.645
• D)two-tailed; values are ±1.645
• E)one-tailed; value is \(\pm\)1.96

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Definitions:

Reaction

A process where one or more substances are converted into different substances through the breaking and forming of chemical bonds.

Reaction Product

The materials that result from chemical reactions.

Organic Chemistry

The branch of chemistry that studies the structure, properties, composition, reactions, and synthesis of carbon-containing compounds.

Organic Product

A substance or material originating from living beings or created through chemical processes involving organic compounds.