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Ping is using a one sample t-test with a two tailed alpha level of .01 to determine if his sample comes from a population with

Ping is using a one sample t-test with a two tailed alpha level of .01 to determine if his sample comes from a population with a mean of 50. His sample has a mean of 49, an n of 15, and a sum of squares of 90. Based on this information what is the absolute value of his critical values (error margin = 0.1)?

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