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 Enter the values for the sample mean, the sample standard deviation and the sample size. 2  Click the Next button to select between a hypothesis test and confidence interval computation. 3  The hypothesis test option is selected by default using a null mean value of zero and a not equal alternative hypothesis. Enter a value for the number of trials in the first sample. 2  Enter a value for the number of successes in the second sample. 3  Enter a value for the number of trials in the second sample. 4  Click the Next button to select between a hypothesis test and confidence interval computation.