A Random Sample of Nine Telephone Calls in an Office

question 27

Short Answer

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.What is the point estimate for the proportion of all calls that were long distance?

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Definitions:

Regression Analysis

A set of statistical processes for estimating the relationships among variables, typically used to determine how the typical value of a dependent variable changes when any one of the independent variables is varied.

Forecast Equation

An equation used in statistical analysis to predict future values based on past data and trends, often involving variables and coefficients.

Percentage of Trend

A statistical measure that represents the direction and movement of data points over a specified period, often used to identify patterns in time series data.

Moving Average

A statistical method used to smooth out short-term fluctuations and highlight longer-term trends or cycles in data.