To test whether arousal or stress levels increase as the difficulty of a task increases, 10 participants were asked to complete an easy, typical, or difficult task. Their galvanic skin response (GSR) was recorded. A GSR measures the electrical signals of the skin in units called micro Siemens (μS), with higher signals indicating greater arousal or stress. The data for each task are given in the table.

(a) Complete the F table.

(b) Compute Fisher’s LSD post hoc test and interpret the results.

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Difficulty of Task Fasy 2.6 3.9 3.4 1.2 2.1 1.2 1.8 2.2 Typical 5.6 4.5 3.7 2.0 3.3 4.6 3.1 2.0 Difficult 9.0 5.6 3.5 7.8 6.4 7.5 4.4 3.8