Question

An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range:

418 421 422 422 426 429 430 434 436 439 446 447 449 453 457 463 465

(c) Calculate a two-sided 95% confidence interval for true average degree of polymerization. (Round your answers to two decimal places.)

( , )

Answer 1

We have for given data,          
              
Sample mean =438.65      
Sample standard deviation =15.227  
Sample size =17      
Level of significance=1-0.95=0.05      
Degree of freedom =16      
              
t critical value is (by using t table)=2.12      
              
Confidence interval formula is               


=(430.82, 446.48)