Question

4. Strength tests carried out on samples of two yarns spun to the same count gave the following…

4. Strength tests carried out on samples of two yarns spun to the same count gave the following results:
Number in
sample Sample
Mean Sample
variance
Yarn A 4 50 42
Yarn B 9 42 56

The strengths are expressed in pounds. Does the difference in mean strengths indicate a real difference in the mean strengths of the yarn?

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