An engineer wants to determine whether the average strength of
An engineer wants to determine whether the average strength of plywood boards (in pounds per square inch) differs depending on the type of glue used.
For three types of glue, she measures the strength of 20 plywood boards. A portion of the data is shown in the accompanying table. The entire data set, labeled Plywood, can be found on the text website.


At the 5% significance level, can she conclude that the average strength of the plywood boards differs by the type of glue used? Assume that the strength of plywood boards is normallydistributed.
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