An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. Seven customers were randomly selected and completed both surveys. The results follow. 
For a 0.05 significance level, what is the critical value?
Definitions:
Decompression Melting
The process where rock melts due to a decrease in pressure as it rises closer to the Earth's surface, without an increase in temperature.
Melting Point
The temperature at which a solid substance turns into a liquid under standard atmospheric pressure.
Oceanic Divergent Boundaries
Boundaries between tectonic plates that are moving away from each other, often resulting in the formation of new oceanic crust through volcanic activity.
Conveyor-belt Manner
A way of describing the movement and recycling of materials, often used in the context of plate tectonics and ocean currents.
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