A tire manufacturer claims that one particular type of tire will last at least 50,000 miles. A group of angry customers do not believe this is so. They take a sample of 14 tires and want to test if the mean mileage of the tires is really 50,000. The customers found that the average tire life of the sampled tires was 49,294 miles and the standard deviation was 870 miles. The value of the test statistic is ________. (Give the answer rounded to 2 decimal places.)

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