A study is under way in Yosemite National Forest to determine the height of adult American pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results. Identify the sample in the study.
举一反三
- A study is under way in Yosemite National Forest to determine the height of adult American pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall. It is estimated that the forest contains 25,000 adult American pines. The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results. Identify the variable of interest in the study.
- What is said about the relationship between these education organizations in the passage A: The Adult Education Association was the predecessor of the American Association for Adult Education. B: The Office of Vocational and Adult Education is a branch of the U. S. Dept. of Education. C: The American Association for Adult and Continuing Education was developed from the National Association. D: The U. S. Dept. of Education is responsible for the American Association for Adult and Continuing Education.
- According to a 75-year-old study on adult developmentis, good ______ keep you happier and healthier.
- The author believes that a study of our dime novels ______. A: is a waste of time B: would be sufficient in itself to determine the essential characteristics of the American tradition C: would be a valuable contribution in determining the essential characteristics of the American tradition D: would be amusing but unimportant
- Study the tree species mentioned in Text A and fill in the blanks with the words given below. Change the form if necessary.olive tree; poplar; pine; Chinese fir; oak; teak; eucalyptus; Pinus patulaUtilization of __________ wood plays an important role in the development of forestry and forest products industry in China.