Following are outstanding credit card balances for a sample of 16 college seniors at a large university.

a. Following is a dotplot for these data. Is it reasonable to assume that the conditions for performing a hypothesis test are satisfied? Explain.

b. According to the report How America Pays for College, by Sallie Mae, the mean outstanding balance for college seniors in 2012 was $515. If appropriate, perform a hypothesis test to determine whether the mean debt for seniors at this university differs from $515.

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