Five different oat varieties were planted in each of the four fields. The following crops were obtained   oat variety field field field field   1 2 3 4 1 296 357 340 348 2 402 390 420 335 3 345 324 358 308 4 360 322 336 270 5 324 339 357 308 Test whether there is a difference in the amount of harvest based on the data

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