The lengths (in feet) of a random sample of suspension bridges in the United States, Europe, and Asia are shown. At α = 0.05, is there sufficient evidence to conclude that there is a difference in mean lengths?

Assume that all variables are normally distributed, that the samples are independent, and that the population variances are equal. Also, for each exercise, perform the following steps.
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results, and explain where the differences in the means are.
Use the traditional method of hypothesis testing unless otherwise specified.

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United States Europe Asia 4260 3500 2300 2000 1850 5238 4626 4347 3379 3300 6529 4543 3668 2874