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.
Monte Carlo simulations were. used to derive a visual rule of thumb that can be used to test the. null hypothesis of equal means, given the confidence intervals of. the means, and the sample sizes (or degrees of freedom). The. type-1 error rate of the test is approximately .05. The rule in-.