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The mean balance of all checking accounts at a bank on December 31, 2009, was $850....

The mean balance of all checking accounts at a bank on December 31, 2009, was $850. A random sample of 55 checking accounts taken recently from this bank gave a mean balance of $780 with a standard deviation of $230. Using the 1% significance level, can you conclude that the mean balance of such accounts has decreased during this period? Answer this question by following the p-value approach.

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