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.
A non-Bayesian 95% confidence interval is Î¸, which is very similar, but the interpretation depends on the subtle notion of âconfidence.â The third general statistical inference problem is hypothesis testing: we wish to determine if the observed data support or lend doubt to a statement about the parameter.