Analyze phase Flashcards
What is the analyze phase about?
to determine the impact of the inputs to our process
Tool applications in the analyze phase
Multi-Vari Chart, Inferential statistics, hypothesis test
Name the 3 sources/causes of variation
Positional, cyclical, temporal
Define positional
a. within subgroup
b. between subgroups
c. overtime
A within subgroup ( individual sample)
Temporal
a. within subgroup
b. between subgroups
c. overtime
C overtime (time to time) or shift to shift. day to day, week to week
Cyclical
a. within subgroup
b. between subgroups
c. overtime
B between subgroup ( between subgroups)
Multi-Vari Chart is a analyze tool that displays patterns of ____
variation
T/F
Multi-Vari chart is only used to identify Temporal variations
F
Used to identify X/ and families of variations of positional, temporal, and cyclical
Multi-Vari Chart are used to analyze ____ of categorical/discrete inputs _____ output
Effects; Continuous
Example: effect on work shifts, impact of operators, setting, or material on Ys,
Effect of noise factors on Y’s
Causes of non-normal distributions.... Skewness Kurtosis Multiple modes Granularity
These dont give solutions but more of a ____ cause information
They give root cause information
Why might Skewness occur? (left/ negative) (right/positive)
Natural limits, artificial limits/sorts, mixtures of data sets, nonlinear relationships, interaction of 2 inputs, nonrandom patterns across time (AGING, WEAR)
Skewness for a normal distribution is A. 5 B. 7 C. 1.5 D. 0
D. 0
how many types of kurtosis?
3:
Mesokurtic- 0
Platykurtic- negative
Leptookurtic- positive
How many types of kurtosis?
3:
Mesokurtic- 0
Platykurtic- negative
Leptookurtic- positive
Dot plot can show what data?
granularity
_____ variance is the result of differences in the shape of the distribution with some special cause
Unequal
what causes granularity?
- measurement system -resolution
- categorization data
level of detail in a set of data
_____ variance is the result of differences in the shape of the distribution with some special cause
A. Equal
B. Unequal
Unequal
used to make decision about how to adjust key process variables based on sample data not population data
Central Limit Therorem CLT
standard deviation for the sampling distribution of means is called
standard error of the mean
t/f
the error decreases when the sample size increases
True
T/F
The error decreases when the sample size increases
True
what is the goal of six sigma projects?
improve process capability to meet customer requirement by moving the process mean or reducing the standard deviation
Helps us make fact based decisions ______ testing
Hypothesis
purpose of hypothesis testing is to integrate the _____ with the Voice of the business
Voice of the process to make data based decisions to resolve problems, avoid high costs of experimental efforts by using existing data
factors that influence decision making
past experience
Current need
Evidence
Risk
____ general statement, predetermined theory, or an assumption about the nature of or relationships between variables
hypothesis
What is null hypothesis?
generally assumed to be true unless sufficient evidence is found to contradict Ho
T/F
Alternate Hypothesis is when the the null hypothesis is considered true
FALSE.
considered true if the null hypo is false. Ha
There are significant differences ____ & _____
practical & statistical
_____ significance amount of difference, change, or improvement that will be practical, economic, or technical value to business
Practical significance
____ significance is the magnitude of difference or change required to distinguish between a true difference, change, improvement…. one that could have occurred by chance
Statistical significance
What order is correct for testing the hypothesis?
- use test statistics, inverval, p-value
- state the null & alternate
- indentify consequences
- establish sample size required
- choose the hypothesis test
- collect data and perform appropriate testing
- choose population parameter
7. 2. 5. 3. 4. 6. 1.
