A two-tailed hypothesis is the most appropriate for a t-test because of the difficulty of determining direction in the variances.

Name: A two-tailed hypothesis is the most appropriate for a t-test because of the difficulty of determining direction in the variances.
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A two-tailed hypothesis is used when we are interested in detecting any significant difference, regardless of direction, not because of difficulty in determining direction in variances.

A Two-Tailed Hypothesis Is the Most Appropriate for a T-Test