Question

What level of measurement do Wilcoxon and KW require?

When is a parametric test used?

What is the Kruskal-Wallace (KW) test?

What is the Wilcoxon test?

What is the sign test? Level of measurement?

Be able to identify the null hypothesis.

Nonparametric tests require / do not require?

When is the Spearman's correlation used?

Know how to reject the null or fail to reject the null at the .05 level.

What is the KW test used for?

Requirements of the KW test?

Know how to assign ranks to a set of data.

For Wilcoxon - calculate the sum of ranks from a table. (Data will be provided)

What did Deming do?

What is Six Sigma?

How common is chance the cause of variation?

What are Pareto charts?

What are control charts?

What do the UCL and LCL of a chart do?

What is an attribute?

What is the purpose of a c bar chart?

What is acceptance sampling and what is the acceptance number?

Look at a defect chart and determine the UCL & LCL? (Data is provided in a table and you must answer questions asking if sales etc. a certain percentage are higher/lower.)

Remember that the normal distribution is used for samples.

Given the number of items & the defects determine the accept/probability.

What is assignable variation?

What is a fishbone diagram?

What is a percent defective chart?

What is the % of the sample within 3 standard deviations?

What is statistical decision theory?

What is an alternative act? An event? An expected monetary value?

What do we mean when we say consequence or payoff?

What is the Maximin strategy? (Be able to define the differences between these and know who uses them)

What is the Maximax strategy?

What is a decision tree?

Does a decision maker control the act?

Does a payoff table = opportunity loss table?

What is the most optimistic of strategies?

In a decision-making strategy - what cannot be controlled?

Applying probabilities to a payoff table results in?

Answer 1

What level of measurement do Wilcoxon and KW require?
Level of measurement for Wilcoxon : ordinal (interval or ratio differences must be converted to ranks).

Level of measurement for Kruskal-Wallace (KW) test
The independent variable must be nominal.
The dependent variable must be ordinal.

When is a parametric test used?
Parametric test are used when we know that the data is normal distributed and we estimate the sample parameter from the distribution.

What is the Kruskal-Wallace (KW) test?
It is a non-parameteric test which is used to determine if the median of two or more groups of data are equal or different.

What is the Wilcoxon test?
It is also called rank-sum test or signed-rank test and is a non-parameteric test. It is used to test if two population have the same continuous distribution.

What is the sign test? Level of measurement?
Sign test is a non-paramertic test which is used to compare the size of two groups of data. The null hypothesis test here is that the difference between the medians of the two group is zero.
It is used on the ordinal level of measurement