3. Consider the following SAS output with missing values patterns:

Missing Data Patterns Group Means Group 2 3 4 5 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Freq 1 so 99 23 99 73 14 percent 36.00 19.80 4.60 1.20 19.80 14.60 2.80 1.20 Y 0.427778 0.474747 0.434783 0.166667 0.474747 0.479452 0.571429 xl 3.171717 3.130435 3.666667 12 2, 666667 2.808081 2.753425 13 o "0000 0, 474747 0.565217 o, 500000 0.565657 0 452055 0.357143 0.333333 x4 0.255556 0.130435 0.282828 0.357143 37.608696 37.666667 38.373737 38.917808 41.214286 39.333333 2.216667 2.262626 2.217391 2.166667 2.222222 2.068493 2.142857 2.166667