A random sample of nine telephone calls in an office provided the following information. 
a.Determine the point estimate for the average duration of all calls.
b.What is the point estimate for the standard deviation of the population?
c.Determine the standard error of the mean.
d.What is the point estimate for the proportion of all calls that were long distance?
e.Determine the standard error of proportion.
Definitions:
Heart Palpitations
The sensation of having rapid, fluttering, or pounding heartbeats.
Panic Attack
A sudden episode of intense fear or acute discomfort, accompanied by physical and psychological symptoms, without any apparent external threat.
Acquire A Phobia
The process of developing an intense, irrational fear of a specific object, situation, or activity, often due to a traumatic experience.
Being Dirty
The state of being unclean or contaminated, either physically with dirt or metaphorically with unethical behavior.
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