If both ends of the range of confidence intervals lie on the side of the line which indicates that treatment does more good than harm, then it will be effective in all circumstances.

Answer:

Yes it is possible for chemist to know

Explanation:

The solution is based on the principle that each product or mixture of K2O or K2O2 will have different proportion of K and this would be the differentiating factor.

For example, percentage of K in K2O is 83 while the percentage of K in K2O2 is 71.

Now if the chemist can measure how much K is there in the mixture, then he can use this data to compare with the percentages stated above.

For example, if K has 83 percentage in mixture, it means it is K2O