Costly Texts. The UCSD bookstore claims that only 10% of the textbooks they carry are over $100. After spending too much money on books, Angelo does not believe their claim. He takes a simple random sample
of 100 textbooks and finds that 15% of them are cost over $100. Does he have statistically significant
evidence that the book store's claim is incorrect? Test at 5% level of significance.
ASSUME all conditions have been met.