A Random Sample of 81 Credit Sales in a Department

question 17

Short Answer

A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.
a.Determine the standard error of the mean.
b.With a 0.95 probability, what can be said about the size of the margin of error?
c.What is the 95% confidence interval of the population mean?

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Definitions:

Rigid Posture

A physical condition characterized by stiffness and inflexibility of muscles, often seen in various neurological and psychiatric disorders.

Clenched Jaw

The act of tightly pressing one's teeth together, often as a physical manifestation of stress or anger.

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In mental health care, refers to the principle of using the minimum level of restriction or intervention necessary to ensure safety or therapeutic efficacy.

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