The sample data \(\)? Explain.(Note: A relevant reference is the article “Simple Statistics for Interpreting Environmental Data,”Water Pollution Control Fed. Why didn’t the investigators put all students in the treatment group? What do you think is the advantage of randomly dividing the students into the two groups rather than letting each student choose which group to join?Ĭ. Are the scores from the SI group a sample from an existing population? If so, what is it? If not, what is the relevant conceptual population?ī. At the end of the term, each student’s total score in the course is determined.Ī. Suppose that students in a large statistics course (what else?) are randomly divided into a control group that will not participate in SI and a treatment group that will participate. Instruction (SI) programs, in which a student facilitator meets regularly with a small group of students enrolled in the course to promote discussion of course material and enhance subject mastery. ![]() Many universities and colleges have instituted supplemental What proportion of these corporations have more than 15 directors? What proportion of these corporations have at most 10 directors?ĭ. If this distribution had appeared in the cited article, would you be able to draw a histogram? Explain.Ĭ. Construct a frequency distribution in which the last row includes all boards with at least 18 directors. ![]() Construct a histogram of the data based on relative frequencies and comment on any interesting features.ī. of Applied Finance, 2010: 57–69) provided the accompanying data on the number of directors on each board in a random sample of 204 corporations.Ī. One of the authors of the article “Does Optimal Corporate Board Size Exist? An Empirical Analysis” (J. The number of individuals on a board varies from one corporation to another. Construct a comparative boxplot (which was included in the cited article) and comment on any interesting features.Įvery corporation has a governing board of directors. Do the fourth spreads for the three samples convey the same message as do the standard deviations about relative variability?ĭ. Calculate, interpret, and compare the standard deviations for the three different samples.Ĭ. Substitute the values of maximum 95 95 and. Compare measures of center for the three different samples.ī. The mid-range or mid-extreme of a set of statistical data values is the average of the maximum and minimum values. The article “Effects of Short-Term Warming on Low and High Latitude Forest Ant Communities” ( Ecoshpere, May 2011, Article 62) described an experiment in which observations on various characteristics were made using mini chambers of three different types: (1) cooler (PVCįrames covered with shade cloth), (2) control (PVC frames only), and (3) warmer (PVC frames covered with plastic).One of the article’s authors kindly supplied the accompanying data on the difference between air and soil temperatures(☌).Ī.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |