Information about conditions at 2 to 4 meters deep in a soil is usually most helpful for understanding:
A) the diversity of animal life in the soil. B) fertility requirements of most crops.
C) how best to design a building foundation. D) the proper classification of the soil.
C
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What type of plunging joint is pictured here?
A) Double offset ball
B) Tripod
C) Cross-grove
D) None of these
All of the following contributed to the Dust Bowl of the 1930s EXCEPT
A. dry-farming techniques. B. unprecedented drought and wind storms of the trans-Mississippi Great Plains. C. farmers' failure to use steam tractors and other modern equipment. D. the cultivation of marginal farmlands on the Great Plains. E. soil erosion.
The article “The Prevalence of Daytime Napping and Its Relationship to Nighttime Sleep” presents results of a study of sleep habits in a large number of subjects. In a sample of 87 young adults, the average time per day spent in bed (either awake or asleep) was 7.70 hours, with a standard deviation of 1.02 hours, and the average time spent in bed asleep was 7.06 hours, with a standard deviation of 1.11 hours. The mean time spent in bed awake was estimated to be 7.70–7.06=0.64 hours. Is it possible to compute a 95% confidence interval for the mean time spent in bed awake? If so, construct the confidence interval. If not possible, explain why not.
What will be an ideal response?
Natural-draft furnaces generally have efficiency ratings of _____
a. below 65 percent b. below 78 percent c. below 85 percent d. 90 percent and above