Are the alloy means different at the 1% significance level (a = 0.01).  Perform t-test using the sample data and do not assume the standard deviations are equal.  Yes  /  No.

MATLAB: An Introduction with Applications
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Are the alloy means different at the 1% significance level (a = 0.01).  Perform t-test using the sample data and do not assume the standard deviations are equal.  Yes  /  No.  Justify answer. 

4 Oneway Analysis of Strength By Alloy Type
16
Strength
14
12
10
4 Quantiles
Level
Alloy B
Alloy A
4t Test
Minimum
8.63
8.77
...
Upper CL Dif
Lower CL Dif
Confidence
-
Alloy B
Alloy A-Alloy B
Assuming unequal variances
Difference
Std Err Dif
10%
25% Median
9.428
10.86
8.818 9.5625
-1.7005 t Ratio
0.5896 DF
Alloy Type
-0.0449 Prob > It|
-3.3561 Prob > t
0.99 Prob <t
Alloy A
75%
13.49
15.036
12.3
10.515 11.3175 12.015
-2.88434
22.92358
0.0084*
0.9958
0.0042* -2
90% Maximum
0
16.26
12.18
2
A
Transcribed Image Text:4 Oneway Analysis of Strength By Alloy Type 16 Strength 14 12 10 4 Quantiles Level Alloy B Alloy A 4t Test Minimum 8.63 8.77 ... Upper CL Dif Lower CL Dif Confidence - Alloy B Alloy A-Alloy B Assuming unequal variances Difference Std Err Dif 10% 25% Median 9.428 10.86 8.818 9.5625 -1.7005 t Ratio 0.5896 DF Alloy Type -0.0449 Prob > It| -3.3561 Prob > t 0.99 Prob <t Alloy A 75% 13.49 15.036 12.3 10.515 11.3175 12.015 -2.88434 22.92358 0.0084* 0.9958 0.0042* -2 90% Maximum 0 16.26 12.18 2 A
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