6.2 Return to the data set concerning the effect of oil type on the amount of wear...
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6.2 Return to the data set concerning the effect of oil type on the amount of wear suffered by piston rings, introduced in Exercise 2.2.
(a) For each oil type, plot the value of wear against the ring number (1–4). Omit the values from the ‘oil ring’ from this plot. Is there evidence of a trend in the amount of wear from Ring 1 to Ring 4?
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