A2. For the five items in Exercise A.1 with missing values, the item means for all cases for whom data were available are as follows: Item                      2              4              6...

A2. For the five items in Exercise A.1 with missing values, the item means for all cases for whom data were available are as follows:

Item                      2              4              6              7              8

Mean                    2.66        5.91        2.93        2.80        2.00

N                             1857       1840       1841       1842       1845

Write a brief statement about whether you think that mean substitution or case mean substitution would be preferred for the five cases with a missing value, based on the information you obtained in Exercise A1. Provide a rationale for your answer.