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A photoconductor film is manufactured at a nominal thickness of 25 mils.

A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film, and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film the sample data result is and , while for the 20-mil film, the data yield and . Note that an increase in film speed would lower the value of the observation in microjoules per square inch

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