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Selecting new insulators materials, a sample of 9 Teflon insulators yielded 110 kvolts with standard deviation...

Selecting new insulators materials, a sample of 9 Teflon insulators yielded 110 kvolts with standard deviation of 5, whereas another sample of 7 PVC insulators yielded an average of 100 kvolts and a standard deviation of 8. Does the material data support the samples’ averages being significantly different?

Test Type: Z______, t_______, d________, Chi SQ_______, F ______, Confidence interval_____,

Answer Significant difference sample averages Teflon versus PVC: Yes___ _____, No________

math   Statistics-And-Probability   
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Answer #1

Solution:

Test type:

We should use t (two-sample independent t-test)

The 95% confidence interval is:

  

Significant difference sample averages Teflon versus PVC:

Answer: Yes, because the confidence interval does not contain 0.

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