Mean output of arrays of solar cells of three types are measured four times under random light intensity over a period of 5 minutes, yielding the results shown below. Research question: At α = .05, is the median solar cell output the same for all three types?

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Solar Cell Output Watts) Output (Watts) Cell Type 124 121 129 125 122 131 127 126 128 123 123 125 126 121 122 128 122 125