Question: 7.1 Assume the data in Example 7.1 are missing always at random (MAAR). Show that given ( y11,, yn1), ????201 and ????211 are unbiased for

7.1 Assume the data in Example 7.1 are missing always at random (MAAR).

Show that given ( y11,…, yn1), ????̂20⋅1 and ????̂21⋅1 are unbiased for ????20⋅1 and

????20⋅1. Hence, show that ????̂2 is unbiased for ????2, assuming appropriate random sampling.

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