SCENARIO 12-6
According to an Article in Marketing News, Fewer $H _ { 0 } : \pi _ { 1 } = \pi _ { 2 } = \pi _ { 3 }$

Short Answer

SCENARIO 12-6
According to an article in Marketing News, fewer checks are being written at the grocery store
checkout than in the past. To determine whether there is a difference in the proportion of shoppers
who pay by check among three consecutive years at a 0.05 level of significance, the results of a
survey of 500 shoppers in three consecutive years are obtained and presented below.
-Referring to Scenario 12-6, what is the form of the null hypothesis? a) $H _ { 0 } : \pi _ { 1 } = \pi _ { 2 } = \pi _ { 3 }$
b) $H _ { 0 } : \pi _ { 1 } = \pi _ { 2 } \neq \pi _ { 3 }$
c) $H _ { 0 } : \pi _ { 1 } \neq \pi _ { 2 } = \pi _ { 3 }$
d) $H _ { 0 } : \pi _ { 1 } \neq \pi _ { 2 } \neq \pi _ { 3 }$