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Business Analytics: Data Analysis & Decision Making

150 SOLVED PROBLEMS

Question: 20.5

CHECKING WHETHER DIAMETERS OF MANUFACTURED RODS MEET SPECIFICATIONS A manufacturing process produces rods for a mechanical device. Engineers have determined that the diameters of the rods must be between 20.80 and 20.95 millimeters; rods with diameters outside these limits are unusable. As part of ...

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The Data sheet in the file is set up exactly as in...
Question: 20.4

MEASURING THE PROPORTION OF DEFECTIVE CHIPS AT SOUNDTECH SoundTech is a company that manufactures electronic chips for sound systems in personal computers. Each chip is classified as conforming or nonconforming. The nonconforming chips cannot be used and are discarded. Each hour 75 chips are tested ...

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The mechanics of constructing a p chart with StatT...
Question: 20.3

MEASURING THE TIMELINESS OF CHECK PROCESSING Woodstock Company, a company in the construction industry, had recently experienced considerable expansion of its business volume. Due in part to this expansion, the finance department of the company was having difficulty processing checks to suppliers ...

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First, it is important to realize that control cha...
Question: 20.2

CHECKING THE QUALITY OF GASKETS MADE ON DIFFERENT MACHINES In a manufacturing process for gaskets, two parallel production machines produce identical types of gaskets. A crucial dimension of the gaskets is their thickness, measured in millimeters. The file Gaskets.xlsx contains data from this ...

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The observations that comprise a particular subsam...
Question: 20.1.b

MEASURING THE VOLUMES OF SODA CANS (CONTINUED) We now assume that the first 30 subsamples of soda can fill volumes, the ones used previously in Example 20.1, were used to determine centerlines and control limits for the X and R charts. When we plot the other 40 subsamples, using the same ...

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As the dialog box in Figure 20.3 indicates, StatTo...
Question: 20.1.a

MEASURING THE VOLUMES OF SODA CANS The file Soda Cans.xlsx contains data on the number of ounces of soda in cans labeled “12-ounce” cans. Every half hour, five cans of soda from a production process were measured for fill volume. This was done for 70 consecutive half-hour periods. Create and ...

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Although \bar{X} and R charts are q...
Question: 19.5

THE EFFECT OF SOAP DISPENSERS ON SOAP SALES SoftSoap Company is introducing a new product into the market: liquid soap for washing hands. Four types of soap dispensers are being considered. SoftSoap has no idea which of these four dispensers will be perceived as the most attractive or easy to use, ...

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At first glance, this might look exactly like a on...
Question: 19.4

TESTING FOR SHARPNESS IN INKJET PRINTERS A computer magazine company regularly tests products from different manufacturers for differences in various aspects of quality. For its next issue, it would like to test sharpness of printed images across three popular brands of inkjet printers. It ...

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This is a single-factor design, where the single f...
Question: 19.3.b

DRIVING DISTANCES FOR GOLF BALL BRANDS (CONTINUED) One golf ball retail shop would like to test the claims that (1) brand C beats the average of the other four brands in cool weather and (2) brand E beats the average of the other four brands when it is not cool. Are these two claims supported by ...

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Let μ_{C,W} be the mean yardage for...
Question: 19.3.a

DRIVING DISTANCES FOR GOLF BALL BRANDS If you are a golfer, or even if you have ever seen golf ball commercials on television, you know that a number of golf ball manufacturers claim to have the “longest ball,” that is, the ball that goes the farthest on drives. This example illustrates how these ...

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This example represents a controlled experiment. T...
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