In the current example, the value of the t statistic is 2.18, which is less than the critical t
value of 2.3 (for a 5% significance level and eight degrees of freedom). Thus, at a 5%
significance level, you must reserve judgment. If you had chosen to use a 10%
significance level, then the critical value of the t distribution would have been 1.86 and
you could have rejected the null hypothesis. The sample size is so small, however, that
the validity of your conclusion depends strongly on how close the distribution of the
population is to a normal distribution.
Probability Values
Another way to report the results ...
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