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6 sigma methodologies > Analyze phase > Flashcards

Analyze phase Flashcards

1
Q

What is the analyze phase about?

A

to determine the impact of the inputs to our process

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2
Q

Tool applications in the analyze phase

A

Multi-Vari Chart, Inferential statistics, hypothesis test

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3
Q

Name the 3 sources/causes of variation

A

Positional, cyclical, temporal

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4
Q

Define positional

a. within subgroup
b. between subgroups
c. overtime

A

A within subgroup ( individual sample)

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5
Q

Temporal

a. within subgroup
b. between subgroups
c. overtime

A

C overtime (time to time) or shift to shift. day to day, week to week

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6
Q

Cyclical

a. within subgroup
b. between subgroups
c. overtime

A

B between subgroup ( between subgroups)

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7
Q

Multi-Vari Chart is a analyze tool that displays patterns of ____

A

variation

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8
Q

T/F

Multi-Vari chart is only used to identify Temporal variations

A

F

Used to identify X/ and families of variations of positional, temporal, and cyclical

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9
Q

Multi-Vari Chart are used to analyze ____ of categorical/discrete inputs _____ output

A

Effects; Continuous

Example: effect on work shifts, impact of operators, setting, or material on Ys,
Effect of noise factors on Y’s

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10
Q 
Causes of non-normal distributions.... 
Skewness
Kurtosis
Multiple modes
Granularity

These dont give solutions but more of a ____ cause information

A

They give root cause information

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11
Q

Why might Skewness occur? (left/ negative) (right/positive)

A

Natural limits, artificial limits/sorts, mixtures of data sets, nonlinear relationships, interaction of 2 inputs, nonrandom patterns across time (AGING, WEAR)

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12
Q 
Skewness for a normal distribution is 
A. 5
B. 7
C. 1.5
D. 0
A

D. 0

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13
Q

how many types of kurtosis?

A

3:
Mesokurtic- 0
Platykurtic- negative
Leptookurtic- positive

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14
Q

How many types of kurtosis?

A

3:
Mesokurtic- 0
Platykurtic- negative
Leptookurtic- positive

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15
Q

Dot plot can show what data?

A

granularity

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16
Q

_____ variance is the result of differences in the shape of the distribution with some special cause

A

Unequal

17
Q

what causes granularity?

  • measurement system -resolution
  • categorization data
A

level of detail in a set of data

18
Q

_____ variance is the result of differences in the shape of the distribution with some special cause
A. Equal
B. Unequal

A

Unequal

19
Q

used to make decision about how to adjust key process variables based on sample data not population data

A

Central Limit Therorem CLT

20
Q

standard deviation for the sampling distribution of means is called

A

standard error of the mean

21
Q

t/f

the error decreases when the sample size increases

A

True

22
Q

T/F

The error decreases when the sample size increases

A

True

23
Q

what is the goal of six sigma projects?

A

improve process capability to meet customer requirement by moving the process mean or reducing the standard deviation

24
Q

Helps us make fact based decisions ______ testing

A

Hypothesis

25
Q

purpose of hypothesis testing is to integrate the _____ with the Voice of the business

A

Voice of the process to make data based decisions to resolve problems, avoid high costs of experimental efforts by using existing data

26
Q

factors that influence decision making

A

past experience
Current need
Evidence
Risk

27
Q

____ general statement, predetermined theory, or an assumption about the nature of or relationships between variables

A

hypothesis

28
Q

What is null hypothesis?

A

generally assumed to be true unless sufficient evidence is found to contradict Ho

29
Q

T/F

Alternate Hypothesis is when the the null hypothesis is considered true

A

FALSE.

considered true if the null hypo is false. Ha

30
Q

There are significant differences ____ & _____

A

practical & statistical

31
Q

_____ significance amount of difference, change, or improvement that will be practical, economic, or technical value to business

A

Practical significance

32
Q

____ significance is the magnitude of difference or change required to distinguish between a true difference, change, improvement…. one that could have occurred by chance

A

Statistical significance

33
Q

What order is correct for testing the hypothesis?

  1. use test statistics, inverval, p-value
  2. state the null & alternate
  3. indentify consequences
  4. establish sample size required
  5. choose the hypothesis test
  6. collect data and perform appropriate testing
  7. choose population parameter
A 
7.
2.
5.
3.
4.
6.
1.

6 sigma methodologies (13 decks)

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