What does this say about the manufacturer''s claim

Reference no: EM131426694

A car manufacturer says that its cars cost €500 a year less to maintain than those of its competitors. To test this, a consumer group found the cost of maintaining 10 cars for a year, and the mean saving was €79 with a standard deviation of €20. What does this say about the manufacturer's claim?

Reference no: EM131426694

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