In a survey of 240 randomly selected students at the University of California - Davis (UCD), 15 said that they were left-handed and 225 said they were right-handed. We would like to know if the proportion of UCD students who are left-handed differs from the national proportion of 0.11.
What is the value of the appropriate test statistic if you want to answer this question by carrying out a test of hypotheses?
Is the proportion of UCD students who are left-handed different from the national proportion of 0.11?