Use the Following to Answer Questions

question 42

Short Answer

Use the following to answer questions :
A sample of 20 from a population produced a mean of 66.0 and a standard deviation of 10.0.A sample of 25 from another population produced a mean of 58.6 and a standard deviation of 13.0.Assume that the two populations are normally distributed and the standard deviations of the two populations are equal.
The null hypothesis is that the two population means are equal,while the alternative hypothesis is that the two population means are different.The significance level is 5%.
-What is the pooled standard deviation of the two samples,rounded to three decimal places?

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Definitions:

Cochlear Duct

A spiral-shaped cavity within the cochlea of the inner ear, filled with fluid and containing the organ of Corti, which produces nerve impulses in response to sound vibrations.

Outer Ear

Portion of the ear consisting of the pinna and the auditory canal.

Middle Ear

Portion of the ear consisting of the tympanic membrane, the oval and round windows, and the ossicles, where sound is amplified.

Semicircular Canals

Structures in the inner ear involved in maintaining balance.