Question: At the beginning of this chapter, we described a study in which participants shouted either a swear word or a neutral word over and over

At the beginning of this chapter, we described a study in which participants shouted either a swear word or a neutral word over and over while holding one hand in a bowl of ice water. The study obtained two scores for each participant: how long the pain could be tolerated while swearing and how long while shouting a neutral word. Which statistical procedure should be used to evaluate the significance of the mean difference between the two groups of rating scores?

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