Exercise$\_9\mathrm{.}9$

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A$)$ Perform KNN analysis to estimate a classification model for the CFA Level $1$ exam using the CFA$\_$Data worksheet and score the $10$ job applications in the CFA$\_$Score worksheet. What are the misclassification rates for k $=3,4,$ and $5$ in the validation dataset?

Use $70-30$ Training and Validation split with $12345$ as the random seed.

k $=3$:

k $=4$:

k $=5$:

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B$)$ What is the optimal value of k in the validation dataset?

optimal value of k:

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C$)$ What is the predicted CFA Level $1$ outcome for the first job applicant in the score dataset?