Problem 2. (8 Points)
Polly Martin, a nurse at public health researcher, is interested in studying the level of trust people invest in medical advice from different sources (trust scores below). Scores are on a scale of 0 to 5, with 0 representing "none" and 5 indicating "a lot." Unfortunately, Martin ran into the problem of missing values and needs to address the issue.
Person Age Internet National News Family Doctor
1 41 and Older 6 10 4
2 40 and Younger 3 3 10
3 40 and Younger Missing Value 1 0 5
4 40 and Younger 4 Missing Value 3 10
5 41 and Older 3 10 7
6 41 and Older 9 6 4
7 40 and Younger 10 2 6
8 41 and Older Missing Value 2 10 Missing Value 5
9 40 and Younger 5 4 5
10 40 and Younger 3 Missing Value 4 8
Step 1: Using listwise deletion, find the average trust from each source (2 pts).
Step 2: Using pairwise deletion, find the average trust from each source (2 pts).
Step 3: Using mean substitution, calculate the five missing values (2 pts).
Step 4: Using subgroup mean substitution based on age, calculate the five missing values (2 pts).
