A researcher is preparing data for a k-fold cross-validation. The number of groups the sample data is to be split into is 10. What would k equal in a 10-fold cross-validation?

• k = 1

• k = 5

• k = 10

• k cannot be determined until applied to a machine model.

  Marta is partitioning her data set into 60% for training and 40% for validation. She is first specifying Member as her target variable. What will she need to program to ensure consistency to fix a random seed?

• myIndex

• trainSet

• createDataPartition

• set.seed

  What is the Euclidean distance between Observation 1 and the origin point of (0, 0, 0)?

  Observation	Y	X1	X2	X3
  1	Red	0	2	0
  2	Blue	2	1	0
  3	Blue	1	0	1

• 2

• 1

• 0

• 3

  A new applicant, age 45, is applying for a loan. Using the table below, what is the estimated probability the loan will be approved? k = 4.

  Record	Age	Marital	Loan			Risk	Default
  1	34	Single	$	5,000.00		High	Yes
  2	24	Married	$	15,000.00		Low	No
  3	49	Single	$	7,000.00		Medium	Yes
  4	32	Other	$	10,000.00		Medium	No
  5	44	Married	$	12,000.00		High	Yes
  6	53	Single	$	9,000.00		Low	NO
  The probable default rate is 75%, the loan will be declined. The probable success rate is 75%, the loan will be approved. The probable success rate is 30%, the loan will be approved. The probable default rate is 25%, the loan will be declined.

  For a new observation of (0, 0, 0), what is the k-nearest neighbor when k = 1.

  Observation	Y	X1	X2	X3
  1	Red	0	2	0
  2	Blue	2	1	0
  3	Blue	1	0	1
  4	Red	0	1	3
  5	Blue	1	1	1
  6	Blue	0	3	0

• 1, 1, 1

• -2, -1, 0

• 0, 1, 3

• -1, 0, 1