Critical Values and Rejection Regions: Videos & Practice Problems

A company claims that at least $60\%$ of its customers are satisfied with its product. To test this claim, a sample of $80$ customers is surveyed, and it is found that $55\%$ of the sample reports being satisfied. Using a significance level of $\alpha =0.05$, test the claim by calculating the critical $z$-value, and determine whether to reject or fail to reject the null hypothesis.