Adry-cleaning establishment claims that a new spot remover will remove more than 70% of the spots to which it is applied. to check this claim, the spot remover will be used on 12 spots chosen at random. if fewer than 11 of the spots are removed, we shall not reject the null hypothesis that p = 0.7. use is information to answer the following 3 problems

a. what is the alternative hypothesis?

b. is this a two sided or one-sided hypothesis test?

after this study, the dry-cleaning establishment finds that the new spot remover removes on average of 10.5 spots out of the 12 spots. a subsequent scientific study determines that this new spot remover removes 70% of the spots to which it is applied. did the cleaning establishment make any error?

a. yes, type ii error

b. no error

c. yes, type i error