A study claims that 85% of bronx high school students experience homework problems. Jessie wants to test this claim, so she randomly samples 60 students and finds that 45 have experienced homework problems. Test the study claim at the 95% level of confidence.
a. Yes, the study's claim is valid
b. No, the study's claim is not valid
c. both a and b are corect, depending on the total number of bronx h.s. students
d. none of the above