Question

Emissions from vehicles are subject to regulations, and across fleets, form the basis for estimating inventories and are the basis upon which new legislation is written, such as the 2012 CAFÉ standards.

For 5 vehicles randomly selected from a fleet of size N, the total CO emissions as measured over 100 miles are as follows:

Table 1. Grams of CO emissions per 100 miles – from 5 vehicles

1	2	3	4	5
501	1467	860	442	495

1. What is the Inventory mean and its standard error based on these measurements for a fleet size of N = 50?

2. What is the Inventory mean and its standard error based on these measurements for a fleet size of N = 500?

Answer 1

A.

n = 50

Inventory mean, y_bar = 3765/5

= 753

Std. Deviation, s = 432.44

Inventory standard error, e = s/

= 61.156

B.

n = 500

Inventory mean, y_bar = 3765/5

= 753

Std. Deviation, s = 432.44

Inventory standard error, e = s/

= 19.334

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