# Hypothesis Testing question

In a training center, a new strategy was implemented. After the implementation of this new strategy the training center claimed that on an average $80\%$ of the students passed. In order to find out whether this claim can be justified, we take a random sample of $30$ students and see that $60\%$ of the students passed. Do we have sufficient evidence to accept the $80\%$ claim?

• Please see stats.stackexchange.com/questions/71127/… The concept is the same. I suppose this could even be marked as a duplicate. – Cristian Dima Sep 30 '13 at 17:17
• @Merovingian Not quite. That Q. is for continuous variables with a specified standard deviation, this is for a count (i.e. binomial) proportion. – Glen_b -Reinstate Monica Aug 9 '14 at 9:18

• (1) One crucial issue in any good analysis of this question is whether to use a two-sided or one-sided interval (or test). What justifies your two-sided approach? (2) By not exploiting the asserted $80\%$ rate, your solution lacks power. – whuber Nov 29 '13 at 21:16