What is the tan of 199° 30' to the nearest ten thousandth?
What will be an ideal response?
0.3541
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Commodities covered by federal government programs include
A) Rice. B) Hay. C) Pork. D) None of the above
In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10°C/s had an average Rockwell (B) hardness of 91.1 and a standard deviation of 6.23, and 40 welds cooled at a rate of 30°C/s had an average hardness of 90.7 and a standard deviation of 4.34.
a. Find a 95% confidence interval for the difference in hardness between welds cooled at the different rates. b. Someone says that the cooling rate has no effect on the hardness. Do these data contradict this claim? Explain.
Unusual noise during a test drive can be caused by ________
A) Defective or worn control arm bushings or ball joints B) Worn or defective CV joints C) Defective wheel bearings or stabilizer bar links D) All of the above
Find the signal energy of each of these signals.
(a) x [n] = 2? [n] + 5? [n ? 3] (b) x [n] = u [n] /n (c) x [n] = (?1/3)n u [n] (d) x [n] = cos (?n/3) (u [n] ? u [n ? 6] ) (e) x [n] = n (?1.3)n (u [n] ? u [n ? 6] ) (f) x [n] = 2 (u [n + 2] ? u [n ? 3] ) ? 3tri (n/3)