In a toy production line, a quality control inspector plays an important role with regard to safety. The inspector will inspect the product color, style, labels, and markings. An ideal toy production line reported that more than 70% of the toys in the entire population meet required specifications. To justify it, the inspector sampled 900 toys from their production process. He found that 233 of the toys did not meet certain specifications.

a. Test at a 1% level of significance. Is there strong statistical evidence to support the report provided by the production line?

b. Construct a 99% confidence interval for the population proportion of toys that did not meet particular specifications.