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 is the pooled proportion?
A)0.723
B)1.408
C)0.494
D)0.807

Question

Quizplus · Accepted Answer

The pooled proportion is calculated by taking the total number of successes (excellent ratings) divided by the total number of trials (both adults and children). Here, (187 adults + 66 children) / (250 adults + 100 children) = 253 / 350 = 0.723.

A Sample of 250 Adults Tried the New Multigrain Cereal