1. State null hypothesis 2. Compute the test statistic 3. Determine the critical value 4. Illustrate the rejection region 5. Draw a conclusin

4. An independent research group is interested to show that the percentage of babies delivered through the Caesarian Section is decreasing. For the past years, 20% of the babies were delivered through Caesarian Section. The research group randomly inspects the medical records of 144 births and finds that 25 of the births were by Caesarian Section. Can the research group conclude that the percent of births by the Caesarian Section has decreased at a 5% level of significance