Of 250 adults who tried a new multi-grain cereal, Wow!, 187 rated it excellent; of 100 children sampled, 66 rated it excellent. What test statistic should we use?
A) z-statistic
B) Right one-tailed test
C) Left one-tailed test
D) Two-tailed test
E) None of these statements are correct

Question

Quizplus · Accepted Answer

The z-statistic is appropriate here because we are comparing proportions from two independent samples (adults and children) to determine if there is a significant difference in their ratings of the cereal.

Of 250 Adults Who Tried a New Multi-Grain Cereal, Wow!