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.
The probability value of the test is the probability of observing a difference as big as or bigger than the absolute value of r â s, given that H 0 is true. Because the probability value of this test is large (Figure 3; P =0.78), we fail to reject the null hypothesis; the data are compatible with the null hypothesis.he difference between and p 0 divided by the standard error gives us the test statistic equation. The denominator of the test statistic, equation. is the value of the standard error given that the null hypothesis is true and p = p 0.