Scrubbers a Factory Recently Installed New Pollution Control Equipment ("Scrubbers")

question 53

Essay

Scrubbers A factory recently installed new pollution control equipment ("scrubbers") on its smokestacks in hopes of reducing air pollution levels at a nearby national park. Randomly timed measurements of sulfate levels (in micrograms per cubic meter) were taken before (Set C1) and after (Set C₂) the installation. We believe that measurements of sulfate levels are normally distributed. Write a complete conclusion about the effectiveness of these scrubbers based on the statistical software printout shown below. $\begin{array}{llllllllllllll}\text { SET C1 } & 10.0 & 8.0 & 8.0 & 7.0 & 6.0 & 9.0 & 11.5 & 8.0 & 9.5 & 7.5 & 5.0 & 10.0 \\\text { SET C2 } & 5.0 & 7.0 & 1.0 & 9.0 & 1.5 & 5.0 & 2.5 & 4.0 & 9.0 & 6.0 & & &\end{array}$

$\text { Two Sample T for C1 vs C2 }$
$\begin{array}{lllll} & \mathrm{N} & \text { Mean } & \text { StDev } & \text { SEMean } \\\mathrm{C} 1 & 12 & 8.29 & 1.83 & 0.53 \\\mathrm{C} 2 & 10 & 5.00 & 2.84 & 0.90\end{array}$
$95 \% \mathrm{Cl} \text { for mu1 - mu2: }(1.20,5.38)$
$\text { T-Test } \mathrm{mu1}=\text { mu2 (vs. not }=\text { ): } \quad T=3.29 \quad \mathrm{P}=0.0037 \quad \mathrm{DF}=20$

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Definitions:

Components

In software and electronic hardware, components refer to individual parts or elements that make up a system or device.

Vectors

In programming, a dynamic array that can grow or shrink in size, often used in languages like Java and C++.

Lists

Ordered collections of elements, which can include various data types and are commonly used in programming.

Table.length

An attribute or property that returns or holds the number of elements in an array or a collection termed "Table."