Question

It is claimed that more than 75 percent of adults always wear a seat belt in the front seat. a poll of 1012 adults resulted in 870 who say that they always wear a seat belt in the front seat. find the value of the test statistic z

Answer 1

Given,

p=0.75

q=1-0.75=0.25

p^=(870/1012)=0.859684

n=1012

z=(0.859684-0.75)/(sqt(0.75*0.25)/1012)

=0.109684/0.013612

=8.058

=8.06 ...ans