An education researcher claims that at most 5% of working college students are employed as teachers or teaching assistant. in random sample of 400 working college students, 6% are employed as teachers or teaching assistants. alpha=0.05,
1. Is there enough evidence to reject the researcher claim?
2. find the critical values and identify the rejection.
3. find the standardized test statistic z
4. decide whether to rejector fail to reject null hypothesis and interpret the decision.