The class score distribution of schools in a metropolitan area is shown here along with an analysis output. Comment on the statistical significance between theMeans of the two distributions. Select the most appropriate statement. Two-sample t for Private_School vs Public_School N Mean StDev SE Mean Private_School 50 4.891 0.422 0.060 Public_School 50 7.15 1.87 0.26 Difference = mu (Private_School) - mu (Public_School) Estimate for difference: -2.259 99 \% CI for difference: (-2.985,-1.534) T-Test of difference =0 (vs not = ): T-Value =-8.32 p-Value =0.000

Correct Answer is : The two class Means are statistically different from each other

The two class Means are statistically different from each other

The two class Means statistically not different from each other

Inadequate information on class Means to make any statistical conclusions

A visual comparison shows that class Means are not statistically different

A visual comparison shows that class Means are statistically different

Six Sigma Lean Black Belt Certification Questions Part 2

Question : 2 of 40

Marks: +1, -0

The class score distribution of schools in a metropolitan area is shown here along with an analysis output. Comment on the statistical significance between theMeans of the two distributions. Select the most appropriate statement.

Two-sample t for Private_School vs Public_School

	N	Mean	StDev	SE Mean
Private_School	$50$	$4.891$	$0.422$	$0.060$
Public_School	$50$	$7.15$	$1.87$	$0.26$

Difference = mu (Private_School) - mu (Public_School)
Estimate for difference:

-2.259

99 \%

CI for difference:

(-2.985,-1.534)

T-Test of difference

=0

(vs not

=

): T-Value

=-8.32

p-Value

=0.000

The two class Means are statistically different from each other
The two class Means statistically not different from each other
Inadequate information on class Means to make any statistical conclusions
A visual comparison shows that class Means are not statistically different
A visual comparison shows that class Means are statistically different

Validate

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