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.
Interpreting the results. The test statistic, T, for H0: m = 5 is calculated as -2.56. The p-value of this test, or the probability of obtaining more extreme value of the test statistic by chance. if the null hypothesis was true, is 0.034. This is called the attained significance level, or p-value. Therefore, reject H0 if your acceptable Î± level is greater than the p-value, or 0.034.