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
|
Construct a 95% con?dence interval for the true difference of means, μ1 - μ2.