Three publishers are to be compared with regard to cost of mathematics and statistics texts. The costs of books in different fields for each publisher is given below. (a) Do the data indicate a true...

Three publishers are to be compared with regard to cost of mathematics and statistics texts. The costs of books in different

fields for each publisher is given below.

(a) Do the data indicate a true difference in the cost of books

produced by the three publishers? Carry out a test at level

a = 0.05.

(b) The first publisher is not located in the United States and

the other two are. Test the null hypothesis that the cost

of books published by the foreign publisher does not differ

from the U. S. publishers (a= 0.05).