An experiment was conducted to estimate the mean level of sulfur content in coal produced by a particular mine. Five days were randomly selected and identified as coal sampling days. On each day, five coal cars were randomly selected and portions of coal were removed from each. Two specimens were prepared from each portion and analyzed for sulfur content. The data are shown in the accompanying table; a MINITAB printout of the analysis follows.

a. Construct an analysis of variance table to display the results.

b. Do the data provide sufficient evidence to indicate that the variation in sulfur content between days exceeds the variation within days? Test using α = .05.

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COALMINE Day 1 3 4 .107 .091 .110 .088 .089 .105 .089 .113 .092 .088 .104 .093 .108 .091 .087 .103 .090 .110 .093 .089 Coal Cars 3 .101 .092 .111 .092 .092 Within Days .099 .093 .108 .089 .090 .106 .091 .106 .088 .091 .105 .091 .108 .087 .090 .108 .092 .106 .091 .086 .104 .090 .109 088 .089 LO 2.