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:

Mental Activity

The cognitive functions and processes that occur within the mind, such as thinking, reasoning, and imagining.

Hypnosis

A trance-like state characterized by increased focus, concentration, and suggestibility, often used for therapeutic purposes.

Meditation

A practice where an individual uses a technique – such as mindfulness, or focusing the mind on a particular object, thought, or activity – to train attention and awareness, and achieve a mentally clear and emotionally calm and stable state.

REM Sleep

The stage of sleep where a person experiences rapid eye movements, dreaming, and paralysis of motor systems; EEGs show beta wave activity, which is also associated with an awake, conscious mind.