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.
We address this question by calculating the. value of a test statistic, i.e., a particular real-valued function of the data. To decide whether. the value of the test statistic is consistent with the null hypothesis, we need to know what. sampling variability to expect in our test statistic if the null hypothesis is true. In other. words, we need to know the null distribution, the distribution of the test statistic when the.