In a recent survey 10 percent of the participants rated Peps

In a recent survey, 10 percent of the participants rated Pepsi as being \'\'concerned with my health.\'\' PepsiCo\'s response included a new \'\'Smart Spot\'\' symbol on its products that meet certain nutrition criteria, to help consumers who seek more healthful eating options. (a) Suppose a follow-up survey showing that 17 of 100 persons now rate Pepsi as being \'\'concerned with my health\'\', calculate the z statistic. (Round your answer to 3 decimal places.)

Solution

The test statisic is

Z=(phat-p)/sqr(p*(1-p)/n)

=(17/100-0.1)/sqrt(0.1*0.9/100)

=2.333