A sample of 250 adults tried the new multigrain cereal "Wow!" A total of 187 rated it as excellent. In a sample of 100 children, 66 rated it as excellent. Using the 0.1 significance level, the researcher wishes to show that adults like the cereal better than children. What test statistic should we use to compare the ratings of adults and children?

Select one:

a. Az-statistic

b. A right one-tailed test statistic

c. A left one-tailed test statistic

d. At-statistic