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

question 165

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) $H _ { 0 } : \pi _ { 1 } \neq \pi _ { 2 } \neq \pi _ { 3 }$

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Definitions:

Hilus

A part of an organ where blood vessels, nerves, and other structures enter or exit.

Oropharynx

A part of the pharynx situated between the soft palate and the epiglottis, involved in swallowing.

Nasopharynx

The upper part of the throat located behind the nose, which forms part of the respiratory system.

Laryngopharynx

The part of the pharynx that lies below the epiglottis and above the esophagus, involved in both respiration and digestion.