# Trying to Understand Null Hypothesis Question

Six Sigma – iSixSigma Forums General Forums General Trying to Understand Null Hypothesis Question

Viewing 9 posts - 1 through 9 (of 9 total)
• Author
Posts
• #240354

Ddelisle
Participant

Hello-

I thought that I sent this question earlier, but cannot find it in the history file.  So here it goes again:

“Following process modifications, the null hypothesis states that no improvement to the process has occurred.  If we discover the null hypothesis was rejected when it was false that would be a(n):

a) Type I error

b) Type II error

c) Type III error

d) Alpha error

Answer per test service is “b”

Based on the wording, I am reading this as the Null was falsely rejected meaning a Type I and Alpha error.   Am I reading this correctly?

Tks,

Derek

0
#240357

Robert Butler
Participant

In this instance the question does not make sense.  The usual way one describes Type I and Type II error is as follows:

Type I error is the risk of rejecting something when it is true.

Type II error is the risk of accepting something when it is false.

So the risk of rejecting something when it is false doesn’t meet the definitions of either Type I or Type II error and Type III error is providing the right answer to the wrong question.

In this case the null is: No improvement in the process occurred

The alternate is hypothesis is : Improvement in the process occurred.

So if improvement did occur in the process then the null was false and we correctly rejected it and we did not commit either Type I or Type II error.

0
#240368

Chris Seider
Participant

respectfully, @Ddelisle find another service for LSS preparations.  Horrible questions they seem to have per what i’ve seen recently.

0
#240369

Ddelisle
Participant

Hi Chis-

As per Prepaway,  these are actual questions from the exams so thought that I was safe notwithstanding that they provided the correct answers which I have a doubt.

Any recommendations for another service that provides exam questions?

Tks,

Derek

0
#240370

Mike Carnell
Participant

@Ddelisle These are question from which exam? There are a lot of exams out there and at least 50% are junk.

0
#240371

Robert Butler
Participant

I guess what I find most disturbing about the statement “these are actual questions from the exams” is the very real possibility of failing someone because they DID know the material and, conversely, passing someone who was ignorant of the correct answer.

0
#240373

Ddelisle
Participant

Mike-

I was not aware of this.  I assumed that the LSSBB exams were prepared by some regulating body similar to CPA exams which I believe is regulated by the AICPA and the respective State CPA society.  I do not have an answer to your question regarding from which exam these questions came from.  I wanted to practice using past test questions so that I can better prepare to take the exam.  I am starting to have my doubts…

0
#240379

Mike Carnell
Participant

@rbutler Most of the exams are not written by people  who are trained educators so the questions can be pretty oddly worded and of course as you can see completely wrong. Chris Seider actually wrote my tests or at least the better part of them and did a nice job.

@Ddeisle There are tons of exams out there and certification is being sold by every person who has the audacity to advertise and charge you and issue you a certificate. The problem as you noted is that it is unregulated. It is a problem and a blessing. Problem is we get this mess we have right now. The blessing is most people who want to have one certifying body that is all powerful over the rest of the industry. The last thing I want is some person with a couple years out of college getting in a position like that and telling me what someone needs to know to be an effective Black Belt.

If you do a search on this website you can find some of the posts where people have dressed themselves up as a certifying body with hundreds of certifications and they sell it but they also spend a ton of time in court over there business practices. There is a person I know who owns a company that trains in Six Sigma. They sat down on a weekend (actually 1 day) and passed 4 online certification exams for Black Belt and 1 for Master Black Belt.

If you want to discuss this further we would need to go off line. My email is [email protected]. You need to remember it will be my opinion only.

0
#240389

Ddelisle
Participant

Hi Mike-

Sent you an email…

Tks

0
Viewing 9 posts - 1 through 9 (of 9 total)

You must be logged in to reply to this topic.