In an Effort to Decide If There Is an Association

question 118

Essay

In an effort to decide if there is an association between the year of a postal increase and the new postal rate for first class mail, the data were gathered from the United States Postal Service. In 1981, the United States Postal Service changed their rates on March 22 and November 1. This information is shown in the table below.

$\begin{array}{|c|c|}\hline \text {Year} & \text {Rate} \\\hline 1971 & 0.08 \\\hline 1974 & 0.10 \\\hline 1975 & 0.13 \\\hline 1978 & 0.15 \\\hline 1981 & 0.18 \\\hline 1981 & 0.20 \\\hline 1985 & 0.22 \\\hline 1988 & 0.25 \\\hline 1991 & 0.29 \\\hline 1995 & 0.32 \\\hline\end{array}$

-Make a scatterplot and describe the association between the year and the first class postal rate.

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Definitions:

Game Theory

A theoretical framework for understanding strategies among rational decision-makers in situations of competition and cooperation.

Strategic Situations

Scenarios where the outcomes for individuals or entities depend not only on their own decisions but also on the actions of others.

Cost-benefit Analysis

A method of evaluating the feasibility and efficiency of a project or investment by comparing the expected benefits with the associated costs.