1.25 Exercise 11.24 compares lead concentrations in cathode ray tubes, depending

Question

1.25 Exercise 11.24 compares lead concentrations in cathode ray tubes, depending on which company manufactured the tubes themselves. The same study also made a comparison, depending on which company manufactured the television screens and computer monitors. (Sometimes, the CRT manufacturer is different from the television or computer manufacturer.) The table below shows concentrations of lead for CRTs in televisions or computers manufactured by 12 four companies Toshiba Samsung Sharp Zenith 60.8 3.2 4.4 21.5 15.4 352 219 10.6 a. Does each of the columns represent a different variable? Explain. b. Report the number of groups I and the total sample size N. c. Use software to produce side-by-side boxplots of the four data sets. Which company's screens and monitors appear to have the most lead? d. Which company appears to have the least lead?

Explanation / Answer

Anova output:

SolutionA:

they are representing the same variable concentrations of lead of diff companies CRts

SolutionB:

4 groups

total sample size=N=15

Solutiond:

sharp has least lead

Solutione:

Samsung has more variability variance=738.06--highest

Solutionf:

Zenith has least variabilty=134.71

Rest of questions post seperately

Anova: Single Factor SUMMARY Groups Count Sum Average Variance toshiba 5 124.6 24.92 729.867 samsung 4 84.1 21.025 738.0692 sharp 3 41.1 13.7 348.79 zenith 3 45 15 134.71 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 317.5018 3 105.8339 0.190827 0.900444 3.587434 Within Groups 6100.676 11 554.6069 Total 6418.177 14

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