Six Sigma Six Sigma Certifications CLSSBB Questions & Answers

• Question 461:

  When comparing two vendors' machines it is found that a sample of 1000 parts from machine A has 23 defectives and a sample of 1300 parts from machine B has 36 defectives. Do the data indicate that machine B has a higher rate of defectives?

  A. yes

  B. no

  C. all of the above

  Correct Answer: A

• Question 462:

  An engineer wants to try two hardening ovens to see whether they have different hardness scores. She cuts 8 pieces of bar stock in half, putting half of each in oven A and the other half in oven B. The following data are collected: Do the data indicate that the ovens have different average scores? Assume differences are normally distributed.

  

  A. yes

  B. no

  Correct Answer: B

• Question 463:

  = 0.05 A machine tool vender wants to sell an injection molding machine. The current machine produces 3.2% defectives. A sample of 1100 from the vender 's machine has 2.9% defective. Do these numbers indicate that the proposed machine has a lower rate of defectives?

  A. yes

  B. no

  Correct Answer: A

• Question 464:

  = 0.05 In problem 1, do the data indicate that the population for machine A has a larger standard deviation?

  A. yes

  B. no

  Correct Answer: B

• Question 465:

  = 0.05 The average weight of castings produced at the Nebraska foundry is 3.7 lbs. A new supplier from Kansas has submitted a batch of castings known to have normally distributed weights. A random sample of 10 has an average weight of

  3.6 lbs. and standard deviation 0.06 lbs. Do these data indicate that the Kansas foundry produce lighter castings on average?

  A. yes

  B. no

  Correct Answer: A

• Question 466:

  = 0.05 A sample of size 50 from machine A has a mean of 18.2 and standard deviation 3.1. A sample of size 40 from machine B has mean 17.6 and standard deviation 2.8. Do these data indicate that the population for machine A has a larger mean? Assume the populations are normal.

  A. yes

  B. no

  Correct Answer: B

• Question 467:

  A medicine with efficacy of .52 is given to five patients. Find the approximate probability that at least one of the patients is cured. (Hint: Use the binomial formula.)

  A. .975

  B. .480

  C. .531

  D. .416

  E. none of the above

  Correct Answer: A

• Question 468:

  

  This table displays the inventory of fasteners in a storage cabinet. An item is selected at random from the fastener cabinet. Find the approximate probability it is larger than 1/2.

  A. .35

  B. .65

  C. .1106

  D. .47

  E. none of the above

  Correct Answer: B

• Question 469:

  

  This table displays the inventory of fasteners in a storage cabinet. An item is selected at random from the fastener cabinet. Find the approximate probability it is a 1/2 inch bolt.

  A. .65

  B. .30

  C. .09

  D. .35

  E. none of the above

  Correct Answer: C

• Question 470:

  This table displays the inventory of fasteners in a storage cabinet. A bolt is selected at random from the fastener cabinet. Find the approximate probability it is size 7/8.

  

  A. 11

  B. .08

  C. .09

  D. .30

  E. none of the above

  Correct Answer: A