10 Chapter 1 Basic Ideas EXCEL Drawing a simple random sample Step 1. In Column A, enter the values 1 through the population size N. For Example 1.5, N = 40. Step 2. In Column B, next to each value in Column A, enter the command =rand( ). This results in a randomly generated number between 0 and 1 in each cell in Column B. Step 3. Select all values in Columns A and B and then click on the Data menu and select Sort. Step 4. In the Sort by field, enter Column B and select Smallest to Largest in the Order field. Press OK. Column A now contains the random sample. Our random sample begins with 17, 12, 28, 20, 6, ... (Figure E). Figure E SECTION 1.1 Exercises Exercises 1–6 are the Check Your Understanding exercises located within the section. Understanding the Concepts In Exercises 7–12, fill in each blank with the appropriate word or phrase. 7. The entire collection of individuals about which information is sought is called a . 8. A is a subset of a population. 9. A is a type of sample that is analogous to a lottery. 10. A sample that is not drawn by a well-defined random method is called a . 11. A sample is one in which the population is divided into groups and a random sample of groups is drawn. 12. A sample is one in which the population is divided into groups and a random sample is drawn from each group. In Exercises 13–16, determine whether the statement is true or false. If the statement is false, rewrite it as a true statement. 13. A sample of convenience is never acceptable. 14. In a cluster sample, the population is divided into groups, and a random sample from each group is drawn. 15. Both stratified sampling and cluster sampling divide the population into groups. 16. One reason that voluntary response sampling is unreliable is that people with stronger views tend to express them more readily. Practicing the Skills In Exercises 17–20, determine whether the number described is a statistic or a parameter. 17. In a recent poll, 57% of the respondents supported a school bond issue. 18. The average age of the employees in a certain company is 35 years. 19. Of the students enrolled in a certain college, 80% are full-time. 20. In a survey of 500 high-school students, 60% of them said that they intended to go to college. Exercises 21–24 refer to the population of animals in the following table. The population is divided into four groups: mammals, birds, reptiles, and fish. Mammals Birds 1. Aardvark 6. Lion 11. Flamingo 16. Hawk 2. Buffalo 7. Zebra 12. Swan 17. Owl 3. Elephant 8. Pig 13. Sparrow 18. Chicken 4. Squirrel 9. Dog 14. Parrot 19. Duck 5. Rabbit 10. Horse 15. Pelican 20. Turkey Reptiles Fish 21. Gecko 26. Python 31. Catfish 36. Shark 22. Iguana 27. Turtle 32. Tuna 37. Trout 23. Chameleon 28. Tortoise 33. Cod 38. Perch 24. Rattlesnake 29. Alligator 34. Salmon 39. Guppy 25. Boa constrictor 30. Crocodile 35. Goldfish 40. Minnow 21. Simple random sample: Draw a simple random sample of eight animals from the list of 40 animals in the table.
navidi_monk_essential_statistics_1e_ch1_3
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