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A sample of 51 Australian male ages 18 - 60 are taken. Their average height is 174.8 cm with a standard deviation of 6.7 cm.

A sample of 51 Australian male ages 18 - 60 are taken. Their average height is 174.8 cm with a standard deviation of 6.7 cm. What is the critical value to be used to construct a 95% confidence interval?

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