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.
Why P Values and Confidence Intervals Always Agree About Statistical Significance. 1  If the P value is less than your significance (alpha) level, the hypothesis test is statistically significant. 2  If the confidence interval does not contain the null hypothesis value, the results are statistically significant.