Authors of a computer algebra system wish to compare the speed of a new computational algorithm to the currently implemented algorithm. They apply the new algorithm to 50 standard problems; it averages 8.16 seconds with true standard deviation o = 0.17 second. The current algorithm averages 8.21 seconds on such problems. Test, at the 1% level of

3) Examine your t-test score in the paired samples t-test table. Is the p value significant? State in one to two sentences whether the test was significant and interpret this result.

Craig owns a ready mis concrete company. Craig receives an order for 1.5 cubic yards of concrete. This mixture of concrete contains sand, cement, gravel, and water; for each pound of water, there are 5lb of sand, 2lb of cement, and 7lb of gravel. Find the total weight of the order (in pounds), assuming a cubic yeard of concrete weighs 4000 lb, and how many pounds of each ingredient must be used. answer in the back of the book is:  water: 400lb sand: 2000lb cement: 800lb gravel: 2800lb please help me set up the equations needed to solve the problem and get the answers given.

For landscape maintenance Gretchen Green uses 4 pounds of fertilizer for every 200 square feet of lawn. At this rate, how many pounds of fertilizer did she use on a lawn that measures 8600 square feet? Round to the nearest whole number. ​