1)When conducting a t-test, if the absolute value of the t-statistic that we calculate is less than the critical t value, we ________________________ the null hypothesis.

2)For a two sample t-test, an alternative hypothesis specifying that the means of each sample are likely to be different and that one mean is higher than the other in the population implies that a ___________ is necessary.

3)What do we call the extreme values (highest and lowest values) of an interval that we are using to estimate a population parameter?