The Depth of a Silicon Wafer Is Targeted at 1

question 18

Multiple Choice

The depth of a silicon wafer is targeted at 1.015 mm. If properly functioning, the process produces items with a mean of 1.015 mm and a standard deviation of ±0.004 A sample of 16 items is measured once each hour. The sample means for the past 12 hours are given in the table below. From the table of data, determine the most accurate mean control chart. $\begin{array}{cccccc}\text { Hour }&1 & 2 & 3 & 4 & 5 & 6 \\\\\text { Mean }&1.013 & 1.015 & 1.016 & 1.017 & 1.014 & 1.013 \\\text { Hour }&7 & 8 & 9 & 10 & 11 & 12 \\\\\text { Mean }&1.014 & 1.017 & 1.016 & 1.013 & 1.017 & 1.016\end{array}$

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Definitions:

Rh-positive

Describes the presence of the Rh factor on the surface of red blood cells, which can play a critical role in blood transfusion and pregnancy.

Rh-negative

A blood type classification indicating the absence of the Rh (Rhesus) factor antigen on the surface of red blood cells.

Hemoglobin

Hemoglobin is a protein in red blood cells responsible for transporting oxygen from the lungs to the body's tissues and returning carbon dioxide from the tissues back to the lungs.

Oxygen

A chemical element (O) essential for life, involved in cellular respiration, where it is used to produce energy from the breakdown of molecules like glucose.