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.
1 The confidence interval does not contain the claimed proportion. 2  Write a conclusion. 3  There is enough evidence if your decision was to reject H0, otherwise, there is not enough evidence.  You will reject the claim if the claim is the null hypothesis and support the claim if the claim is the alternative hypothesis.