2022 Introduction to Statistics in Research Mitchell 2nd ed

I N T R O T O R E S E A R C H : D A T A V I S U A L I Z A T I O N & C O M M O N S T A T T E S T S

What is really interesting is the fatalities as a percentage of all crewmen. Essentially, blue shirts die less frequently than expected, gold shirts die more frequently than expected, and red shirts die at the expected rate.

You can find the numbers in the contingency table, but I thought you might want to see how this was created.

Blue Uniform : 7 deaths/136 total blue shirt crewmen = about 5.1%

Gold Uniform : 9 deaths/55 total gold shirt crewmen = 16.4%

Red Uniform : 24 deaths/239 crewmen = 10.0%

We can conclude that, as a percentage of the entire crew, gold shirts have the highest percentage. What? If you break down the red shirt crew into security and non-security areas, you will discover a 20% mortality rate for security personnel and only a 4% mortality rate for non-security. That is a significant difference with a p -value of 0.000. Table 75: Fatalities as a percentage of all crewmen

Essentially the ranking of mortality is:

1. Security officers (red shirts)

2. Command and Helm (gold shirts)

3. Science and Medical (blue shirts)

4. Operations and Engineering (red shirts)

So the deaths depend on the area you work, and it makes sense that security officers in red shirts would have the highest fatality rate (security has a death rate that exceeds 15%)!

Thank you Statistics by Jim for sharing this data!

QUIZ: You may have noticed “Quiz” randomly placed throughout this chapter. These serve as “hints” for you to review the information carefully!

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