A Statistics Teacher Wants to See If There Is Any $\begin{array}{ll}&\text { Today } & \text { Five Years Ago } \\\bar {x}&82 & 88 \\\sigma^2&112.5 & 54 \\n&45 & 36\end{array}$

question 58

Multiple Choice

A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago.A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken.You are given the following information. $\begin{array}{ll}&\text { Today } & \text { Five Years Ago } \\\bar {x}&82 & 88 \\\sigma^2&112.5 & 54 \\n&45 & 36\end{array}$
The test statistic for the difference between the two population means is

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Definitions:

Health Center

A facility offering primary and sometimes secondary health care services, often focused on the community or specific patient groups.

Cytokines

Small proteins released by cells, especially those in the immune system, that have an effect on the interactions and communications between cells.

Immune System Cells

Components of the immune system, such as white blood cells, that work to protect the body from infectious diseases and foreign invaders.

Nervous System

The network of nerve cells and fibers that transmits nerve impulses between parts of the body, controlling and coordinating bodily functions.