In order to compare the mean Hemoglobin (Hb) levels of well-nourished and undernourished groups of children, random samples from each of these groups yielded the following summary.
|
|
Number of children
|
Sample mean
|
Sample standard deviation
|
|
Well nourished
|
95
|
11.2
|
0.9
|
|
Undernourished
|
75
|
9.8
|
1.2
|
Test at α = 0.01 whether the mean Hb levels of well-nourished children were higher than those of undernourished children.