Basic Stats
This is the difference between a population of data and a sample of data.
What is a population is all of the data points for given process; a sample is a subset of the population
This term refers to the ability of a measurement system to see differences between the items being measured based on the units of measure being used.
What is Resolution/Discrimination?
A family of data charting tools that help identify if there are statistically unusual things happening in a process.
What is SPC (Statistical Process Control or Control Charts)?
To fully describe a normal distribution, you only need these 2 things (statistics).
What is Mean and Standard Deviation?
This term is used for when entire units are being evaluated on a good/bad scale.
What is Defectives?
The three measurements of centering (central tendency of the data)
ALSO, these are the three measures of spread.
What are Mean (average), Median, and Mode?
Also, what are Range, Standard Deviation, and Variance?
The type of measurement variation evaluated when comparing the results of different appraisers measuring the same item over and over.
What is Reproducibility?
At least 3 interchangeable terms that describe a process that has no statistically unusual data points and no statistically identifiable patterns or trends.
What is stable process, in-control, random, predictable, common cause variation?
In a normal distribution, what percent of the population can be found within ±2 Standard Deviations of the Mean?
What is 95.44%? (Acceptable answer: 95%)
This Minitab tool can be used to quickly analyze data without a graphical analysis (provides numbers only)
What is Display Descriptive Statistics (Stat>Basic Stats>Display Descriptive Statistics)
Analysis of a sample of data taken on wait times at a clinic resulted in an average of 20.47 minutes and a 95% confidence interval of (17.812 , 23.134). This is the correct interpretation of the confidence interval.
What is, we are 95% confident that the population average (true average) is between 17.812 minutes and 23.134 minutes.
In an Attribute MSA, a measurement process cannot have good Reproducibility if it does not have good _____________.
What is Repeatability?
The top chart of this control chart combination plots each individual data point in time series order.
What is I-MR?
The p-value threshold used to determine if a data set is Normally distributed (or not).
What is .05?
These are the 2 ways that special causes appear on control charts.
What are outliers and non-random trends/patterns?
A GB wants to determine the average gas mileage of their car within plus or minus 1 MPG. If the standard deviation for their gas mileage is 7 MPG, this is the total number of data points they need to collect.
What is 191 data points?
This statistic is used in an Attribute MSA to evaluate the acceptability of the measurement process (R and R)
What is Kappa?
This type of control chart is used to plot the COUNT of defective units when there is a constant sample sizes.
What is NP chart?
These two Minitab tools can be used to statistically test to see if a data set is normally distributed.
What is Probability Plot (Fat Pencil test) and Anderson-Darling Test (Graphical Summary is acceptable)?
The values at which the tails on a Normal distribution extend to.
What is ±infinity?
In your Support File folder, open the Minitab file called "Clinic Wait Times."
This clinic has the lowest average wait time.
This is the confidence interval for THAT ONE clinic.
This is the result of an INITIAL practical validation of THAT ONE clinic's data.
What is Clinic 2 (20.47 minutes)?
What is (17.812 , 23.134)?
What is, there are concerns with data accuracy due to one negative value (outlier on the low side). Negative wait times are not possible.
This is the preferred number of samples to use in a Statistical MSA where the evaluations being made are Good vs. Bad.
What is 100 samples?
Minitab calculates the UCL and LCL of a process which represents this voice. (Not always the same as customer expectations)
What is Voice of the Process?
From your Support File folder, open the Minitab file "Lab TAT." This is the p-value for a normality check of the data.
What is 0.493?
Used to quantify the degree of measurement accuracy by determining whether differences in data are due to actual (true) differences or to variation in measurement methods.
What is Statistical MSA?