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hw_07 - Name(s(up to four students per homework set Due In...

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Due: In class, Friday March 21, 2008 Name(s) (up to four students per homework set) : Section number(s) 1. 2. 3. 4. For instructor or TA use only: Problem Score Points 1 10 2 20 3 20 4 20 5 15 6 15 M E 345 Spring Semester, 2008 Homework Set # 7 Professor J. M. Cimbala Total: 100 1 . (10 pts) Consider the decimal number 187. ( a ) Convert the decimal number into 12-bit binary, showing all your work. ( b ) Work “backwards” to verify your result, again showing all your work. 2 . (20 pts) Hank works for an agricultural engineering design company after graduation. One of his first assignments is to improve the performance of a machine that separates grain using high-speed air jets. Hank test 12 of the jets, measuring the average velocity produced by each jet (in units of m/s). Let’s call this sample A. Then Hank makes a modification to 10 jets, and re-tests them in the otherwise identical conditions. Let’s call this sample B. An Excel spreadsheet accompanies this homework set. It contains both data sets. ( a ) Perform a two-sided independent samples hypothesis test “by hand,” and calculate the percentage confidence level (to three significant digits) that there is a change in the jet speed. Note : “by hand” means you may use Excel for the calculations, but you cannot use the built-in macro for a two-sample t -test. In other words, calculate the

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hw_07 - Name(s(up to four students per homework set Due In...

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