Question

A chemist prepared ten 4.85 g quantities of aniline and purified it to acetanilide using fractional crystallization. The following dry yields were recorded.

3.83	3.78	3.86	3.86	3.90
3.36	3.60	4.02	3.74	3.83

Estimate the mean grams of acetanilide that can be recovered from an initial amount of 4.85 g of aniline. Use a 95% confidence interval. (Round your answers to three decimal places.)

g_____ to_______ g

Answer 1

We have for given data,      
          
Sample mean =3.778  
Sample standard deviation =0.1826
Sample size =10  
Level of significance=0.05  
Degree of freedom =9  
          
t critical value is (by using t table)=2.2622
          
Confidence interval formula is

=(3.647,3.909)          

Therefore,, 95% confidence interval is 3.647 g to 3.909 g