1 The total project cost for a Trex deck ranges between $1,500 and $2,200 for a 250sf deck. 2  Trex Select of basic quality averages approximately $7/sf.  Trex Enhance of higher quality is approximately $8/sf.
When the hypothesized value is zero then there is a simple relationship between hypothesis testing and confidence intervals: If the interval contains zero then the null hypothesis cannot be rejected at the stated level of confidence. If the interval does not contain zero then the null hypothesis can be rejected.
To tie it in with the discussion of confidence intervals, suppose we get a particular sample average $v$, from which we construct confidence intervals of different sizes. Suppose a 95% confidence interval for $\mu$ does not contain $m$. Then we can reject the null-hypothesis $\mu=m$ at level 0.05. Then suppose we grow the confidence interval until it just touches (but doesn't include) the value $m$, and suppose this is a 98% confidence interval.