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George Mason University
School of Management
OM 210:
STATISTICAL ANALYSIS FOR MANAGEMENT
Professor Harvey Singer
TEST #3:
Inference and Regression (SAMPLE)
Sampling Distributions of the Sample Mean
Directions:
Report all probabilities as decimals to 4 decimal places.
Round z to 2
decimal places to use the standard normal table.
Report calculated ages to 3 decimal
places.
A large supermarket chain employs over 9,000 people.
It has been stated by the
company that the mean age of all of its employees (the population) is 43.7 years
with a standard deviation of 8.3 years.
The company is thinking of introducing a
healthcare package, and its insurance carrier wants to sample 48 employees
before quoting a price.
1. Describe the sampling distribution of the sample mean in terms of
(1) the numerical value of its mean,
(2) the numerical value of its standard error of the mean, and
(3) its shape (and you must explain why).
2. Suppose a single random sample of
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This note was uploaded on 02/19/2011 for the course OM 210 taught by Professor Singer during the Spring '08 term at George Mason.
 Spring '08
 SINGER

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