Chp 4-5 Practice_​Dylan Lyles

Data Set

1. Counting Outcomes of "Churn" based on customerID aggregation

= 1869/7043

26.537%

1. Grouping the conditional variable "Given" of the data set being from a "senior citizen"

2. Counting "Churn" outcomes "Given" that the data is from a "senior citizen"

= 476/666 = 71.471%

1. Grouping the data into "senior citizen" and also "Churn" and aggregating by counting the "customerID"

= 476/7043 = 6.758%

1. Calculating the probability of "PaperlessBilling" AND "FiberOptic InternetService" based on the aggregation of "customerID".

1. Aggregating those based on "InternetService" and then separately, "PaperlessBilling" to find probabilities. Lastly, we group both to find the intersection.

2. Probabilities

Fiber Optics=

43.956%

Paperless Billing=

59.222%

Intersection=

34.006%

Both Fiber Optics AND Paperless Billing=

34.006%

Fiber Optics OR Paperless Billing=

69.161%

P(a)= 3096, P(b)= 4171, P(A and B)= 2395

1. Find the probability that someone uses the "Payment Method" of "Electronic Check" GIVEN they have a "Contract" with a value of "two year"

2. Answer

= 169/7043

= 2.4%

1. Mean = $64.762

2. Standard Deviation = $10.09

3. Lower Bound = $4.582

4. Upper Bound = $124.942

1. The percentage that fell within 2 Standard Deviations of the Mean is 100%