# 2: T test for two means
The data in SteelStrengthData.txt consists ofn1= 32 strengthmeasurements of cold-rolled steel andn2= 35 measurements oftwo-sided galvanized steel. Import it into the data framedf2 andcomplete the following parts.
Use boxplot(Value∼Sample, notch=TRUE, data=df2) to do acomparative box plot. Do the two medians appear significantlydifferent? (NOTE:∼does not copy-paste well.)
Test the hypothesisH0:μ1−μ2= 0 vs Ha:μ1−μ26= 0, at level ofsignificance 0.1, without assuming σ1=σ2. Report the outcome of thetest and also the 90% CI for μ1−μ2.3. Repeat the above using theassumption that σ1=σ2.
Using R please
