When the direction of the difference between two sample means is not specified, we must use the two-tail t.
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Q67: The greater the number of degrees of
Q68: With an infinite number of degrees of
Q69: The mean of the distribution of differences
Q70: The true standard error of difference is
Q71: The estimated standard error of difference estimates
Q73: When the null hypothesis is rejected, then
Q74: When the two sample means are equal,
Q75: The central limit theorem suggests that the
Q76: The t ratio may only be calculated
Q77: When there is a failure to reject
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