Joe thinks that no more than 20% of students in his statistics class will get an A in the final examination. To prove his claim, he takes a random sample of 35 students and finds to his suprise that 30% of his students got an A. At a .01 percent level of significance can we reject Joe's view?(adsbygoogle = window.adsbygoogle || []).push({});

I do not want the answer to this question, I would just like to know what formula to use, and why. Thank you so much I really appreciate it.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Probability formula

**Physics Forums | Science Articles, Homework Help, Discussion**