Quiz5Akey - EMA 4714 Materials Selection and Failure...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
EMA 4714 - Materials Selection and Failure Analysis Friday, March 28, 2003 1. [10 points] Two batches [10,000 pieces each] of self-tapping steel fasteners were received from a heat treating facility who claimed that one batch had been tempered for twice the time as the other. The paperwork had been misplaced and there was no way of knowing which batch was which. A series of hardness measurements performed on pieces selected at random from each batch resulted in data contained within the table below. For your convenience, I have calculated means and standard deviations for the two sets of sample data. Based on your statistical analysis, and using a level significance [ α ] of 0.05, does the data allow a determination that the two batches were subjected to different tempering times? Show, or explain, your work. *************************************************************************** s 2 2 /s 1 2 = 9.378/3.556 = 2.638, less than F(table) = 3.180 Use Statistical Test 6, σ unknown and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

Quiz5Akey - EMA 4714 Materials Selection and Failure...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online