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Questions 17-20: A crayon manufacturer is comparing the effects of two kinds of red dye on the brittleness of crayons. Dye B is more expensive than dye A, but it

is thought that it might produce a stronger crayon .The impact strength (in joules) is measured for each crayon and population variances are assumed to be equal. The summary statistics are as follows:

Fig: 1

Fig: 2