Environmental Science: A Global ConcernEnvironmental Science: A Global Concern 11th Edition by William Cunningham, Mary Ann Cunningham

تمرين 14

If the distance between upper and lower confidence limits (the confidence interval ) is narrow, then we can be reasonably sure the trend in our sample is close to the trend for the total population of that species. What is the reported trend for ring-necked pheasant What is the number of routes (N) on which this trend is based What is the range in which the pheasant's true population trend probably falls Is there a reasonable chance that the pheasant population's average annual change is 0 That the population trend is actually 5
Now look at the ruffed grouse, on either the table or the graph. Does the trend show that the population is increasing or decreasing Can you be certain that the actual trend is not 7, or 17 On how many routes is this trend based