You Wish to Construct a 95% Confidence Interval to Compare

question 30

Multiple Choice

You wish to construct a 95% confidence interval to compare the mean measurement for two groups.A small pilot study yields sample standard deviations of 10 and 15 for Group 1 and Group 2,respectively.If we wish to obtain a margin of error of at most 5,what sample size should we take from each group? Assume equal sample sizes.

• A)46
• B)50
• C)48
• D)47
• E)49

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Definitions:

Left Ventricle

A chamber in the heart that pumps oxygenated blood out to the body.

Elasticity

The ability of a material or body to resume its normal shape after being stretched or compressed.

Conduction Cells

Specialized cells that transmit electrical impulses within the heart, facilitating coordinated heartbeats.

Aortic Semilunar Valve

The valve that regulates blood flow from the heart into the aorta, preventing backflow into the ventricle.