Lady Luck

Lady Luck is a quest in the Fallout 4 add-on Vault-Tec Workshop.

Detailed walkthrough
The final experiment focuses on attempting to harness peoples' vices to increase productivity. Valery Barstow wants to focus on greed, and as such has a prototype slot machine for you to build, power, and set parameters.

Because Barstow herself created the prototype, there are no R&D team notes available on each parameter, but instead can be accessed in her notes under the second menu. You can choose from: Indentured Servitude, Customer Profiling, or Lost Revenue to make the resident win every time. 

After Clem has gambled for an hour, Barstow will approach and analyze the results. Depending on your choices on the previous experiments, she will be satisfied or mixed on the results and announce her plans to head out into the wasteland or convinced to stay through a speech check, or if she is dissatisfied she will become angry and leave.

Regardless of your decision, she will give you a unique vault suit, reducing damage from ghouls by 15%, and the quest will end.