Question

Question 21 10.5 pts A tool manufacturer tests three types of cutters used in lathe operations. One type is a laminated steel cutter consisting of very hard high-carbon steel sandwiched between two softer steels. Another is a special high- speed steel cutter developed using power metallurgy. The final one is made from cryogenically treated steel. A random sample of each of the three types is tested to see how long they will last (in hours) in continuous operation until they need to be sharpened. The times are recorded for each cutter used in the study, and the results of ANOVA and multiple comparison are summarized below. Count Sum SUMMARY Groups laminated steel high-speed steel cryogenically treated steel 35 35 35 953.05 1090.95 1144.15 Average 27.23 31.17 32.69 Variance 17.89 63.04 33.87 Standard Deviation 4.23 7.94 5.82 df MS F ANOVA Source of Variation Between Groups Within Groups SS 555.87 3903.50 P-value 0.0011 F crit 3.09 Total 4459.37 Multiple Comparisons Pair laminated vs. high-speed laminated vs. cryogenical high-speed vs. cryogenical t -2.66 -3.69 -1.03

Answer 1

0. 47 yes which is 32169 yet becouse meen for high speed Cutter is higher than claminated Stell lettor 61 yy, because the mean of Cryogenically cutter is higher then two witter 77 yes, because the mean is which is less than . Only 27.23