Zocdoc.com provides a service to find and make appointments with medical professionals across the United States. Suppose an analyst looking to see if a new web design had improved the percentage of people successfully making appointments found a z-score of 10.23.
a) Explain what the z- statistic means in this context.
b) Look up the 0.001 upper critical value for a z-statistic and state your conclusion about the test.
c) Why did you probably not need to look up the critical value in b) to reach your conclusion?