A multiple-comparison procedure for comparing four treatment means produced the confidence intervals shown below. For each pair of means, indicate which mean is larger or indicate that there
Is no significant difference.

\begin{array}{l}\left(\mu_{A}-\mu_{B}\right):(18,34) \\\left(\mu_{A}-\mu_{C}\right):(7,23) \\\left(\mu_{A}-\mu_{D}\right):(6,18) \\\left(\mu_{B}-\mu_{C}\right):(-17,-5) \\\left(\mu_{B}-\mu_{D}\right):(-22,-6) \\\left(\mu_{C}-\mu_{D}\right):(-13,7)\end{array}

\mu_{\mathrm{A}}>\mu_{\mathrm{B}} ; \mu_{\mathrm{A}}>\mu_{\mathrm{C}} ; \mu_{\mathrm{A}}>\mu_{\mathrm{D}} ; \mu_{\mathrm{B}}<\mu_{\mathrm{C}} ; \mu_{\mathrm{B}}<\mu_{\mathrm{D}} ; \mu_{\mathrm{C}}<\mu_{\mathrm{D}}

\mu_{\mathrm{A}}<\mu_{\mathrm{B}} ; \mu_{\mathrm{A}}<\mu_{\mathrm{C}} ; \mu_{\mathrm{A}}<\mu_{\mathrm{D}} ; \mu_{\mathrm{B}}>\mu_{\mathrm{C}} ; \mu_{\mathrm{B}}>\mu_{\mathrm{D}} \text {; no significant difference between } \mu_{\mathrm{C}} \text { and } \mu_{\mathrm{D}}

\mu_{\mathrm{A}}>\mu_{\mathrm{B}} ; \mu_{\mathrm{A}}>\mu_{\mathrm{C}} ; \mu_{\mathrm{A}}>\mu_{\mathrm{D}} ; \mu_{\mathrm{B}}<\mu_{\mathrm{C}} ; \mu_{\mathrm{B}}<\mu_{\mathrm{D}} \text {; no significant difference between } \mu_{\mathrm{C}} \text { and } \mu_{\mathrm{D}}

D) no significant difference between

\mu_{\mathrm{A}}

and

\mu_{\mathrm{B}} ; \mu_{\mathrm{A}}<\mu_{\mathrm{C}} ; \mu_{\mathrm{A}}<\mu_{\mathrm{D}} ; \mu_{\mathrm{B}}>\mu_{\mathrm{C}} ; \mu_{\mathrm{B}}>\mu_{\mathrm{D}} ;

no significant difference between

\mu_{\mathrm{C}}

and

\mu \mathrm{D}

Which of the Following Is Not a Condition Required for a Valid

Multiple Choice

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