TABLE 12-13
According to an Article in Marketing News, Fewer

question 130

Short Answer

TABLE 12-13
According to an article in Marketing News, fewer checks are being written at grocery store checkout stands 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.
$$\begin{array}{l}\text {\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad Year }\\\begin{array} { c | c | c | c } \hline\text { Check Written } & \text { Year 1 } & \text { Year 2 }&\text{Year 3 } \\\hline \text { Yes } & 225 & 175 & 125 \\\text { No } & 275 & 325 & 375\end{array}\end{array}$$
-Referring to Table 12-13, what is the critical value?

---

Definitions:

Environmental Resistance

Total of factors in the environment that limit the numerical increase of a population in a particular region.

Carrying Capacity

The maximum population size of a species that an environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.

Exponential Growth

Growth, particularly of a population, in which the increase occurs in the same manner as compound interest.

Lag Phase

The initial period of slow growth or inactivity that occurs after bacteria are introduced to a new environment or nutrient medium.