A Multiple-Comparison Procedure for Comparing Four Treatment Means Produced the Confidence

question 25

Multiple Choice

A multiple-comparison procedure for comparing four treatment means produced the confidence intervals shown below. Rank the means from smallest to largest. Use solid lines to connect those means which are not significantly different. $$\begin{array} { l } \left( \mu _ { 1 } - \mu _ { 2 } \right) : ( 8,20 ) \\\left( \mu _ { 1 } - \mu _ { 3 } \right) : ( - 8,4 ) \\\left( \mu _ { 1 } - \mu _ { 4 } \right) : ( 8,22 ) \\\left( \mu _ { 2 } - \mu _ { 3 } \right) : ( - 22 , - 10 ) \\\left( \mu _ { 2 } - \mu _ { 4 } \right) : ( - 2,4 ) \\\left( \mu _ { 3 } - \mu _ { 4 } \right) : ( 13,21 ) \end{array}$$

• A) \(24 \overline { 13 }\)
• B) 4213
• C) \(\overline { 41 } \overline { 23 }\)
• D) \(\overline { 42 } \overline { 13 }\)

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Definitions:

Excitatory Neurotransmitter

Chemical substances that transmit nerve signals across a synapse from one neuron to another, typically promoting an action potential.

Glutamate

A major neurotransmitter in the brain involved in learning, memory, and the regulation of the nervous system's excitatory signals.

Brain

The organ located in the head of an organism that controls most of the activities of the body, processes sensory information, and is the center of thought and emotion.

Endorphins

Neurochemicals produced in the brain that act as natural painkillers and also boost feelings of pleasure or well-being.