The A-1 Video Rental Has Run Two Specials in the Local

question 27

Essay

The A-1 Video Rental has run two specials in the local newspaper.One was a two-for-one rental for Tuesday through Thursday.The second was for $1 off on Friday and Saturday.A computer output is shown below: $$\begin{array} { l c r c c } & \text { n } & \text { MEAN } & \text { STDEV } & \text { SEMEAN } \\\text { Tues-Thur } & 15 & 185.5 & 28.2 & 7.3 \\\text { Fri-Sat } & 13 & 268.2 & 30.6 & 8.5\end{array}$$ Determine at the 0.05 level if the standard deviations of the populations are equal.
Test statistic = ____________________
Conclusion: ____________________

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Definitions:

Antigens

Substances that the immune system recognizes as foreign or dangerous, prompting an immune response.

Cardiac Output

The amount of blood pumped by the heart. One of the two major variables that determine blood pressure. Cardiac output is itself determined by two other variables: the rate at which the heart beats (commonly measured in beats per minute) and the amount of blood ejected from the heart (stroke volume). See also total peripheral resistance.

Blood Pressure

The force of circulating blood on the walls of blood vessels, often measured as an indicator of cardiovascular health.

Cellular Immunity

One of the three general categories of immune response, based on the action of a class of blood cells called T-lymphocytes. The “T” designation refers to the locus of their production, the thymus gland. Cellular immunity results from a cascade of actions of various types of T-lymphocytes.