Hi I have this question.
If of tyres of failed to last miles, while the corresponding gures for tires of , , and were , and , test the null hypothesis that there is no dierence in the quality of the four kinds of tyres.
Use .
Thank-you so much!
The number of failure in 200 trials with a given probability p has a binomial distribution B(200,p), which you can probably approximate in this case by a normal. You now need to find an interval such that the probability of none of four observations from this distribution are out side is 5%.
CB