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  3. # 2: t test for two means the data in steelstrengt

# 2: T test for two means The data in SteelStrengthData.txt consists ofn1= 32 strength measurements of...

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Statistics

# 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

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