Question

3.12 Many animals are in danger of extinction. One way to see the extent of the problem is to study the numbers of animals on the endangered species list. The following data show the numbers of endangered species for various groups of animals. The count is the total number of endangered species within the group. Thus, there are 37 mammals on the en- dangered species list within the United States and 249 others in the rest of the world. United States United States and foreign Foreign only Group 249 Mammals Birds Reptiles Amphibians Fishes Snails Clams Crustaceans Insects Arachnids SOURCE: The World Almanac, 1994. a. If you wanted to summarize these data for the United States in a single number, what number do you think would be the most meaningful? Why? b. If you wanted to summarize the situation for endangered mammals worldwide, in cluding the United States, what number do you think would be the most meaningful? Why? 70 Chapter 3 Some Basic Concepts of Statistics c. Does the average of the numbers in the United States column have a useful interpre- tation? Explain. d. Write a paragraph summarizing the information in the data set. Make use of the sum- mary numbers you chose in parts (a) and (b).

Answer 1

For United states I will suggest 57 number, Because 57 number is highest in column of United states and it is belongs to spacies Birds that means mast large numbers of the bird. species are endang ered. If we are summarizing endangered mammals worldwide then I will suggest to take highest value from that. Because in the countary correspon. ding to highest value large number of mammals are endangered. C) No the average number is not that much meaniaful to interpretate the column of united states. Because this data contain lots of outliers .so the interpretation on mean will not be meanigtul - from the given data in united states Bird endangered species are high and Arachnids endangered spacies are low. While observing United states and foreign column we can see that mostly mammal endangered species are I high in number accordingly other are low and some are o in number. In Foreign only mmals are endangered species are large in number. Below that Bird endangered secies are high and then reptiles. Other are accordingly very low.