2.  frequency table – a table that lists each item in a data set and the number of times each item occurs

3.  frequency table – table that lists each item in a data set and number of times each item occurs

4.  line plot – a graph that shows the shape of a data set by stacking x’s above each data value on a number line.

5. What does each x stand for?

6. 4 customers 8 customers customers

7.  histogram – a bar graph with no spaces between the bars. The height of each bar shows frequency of data. The intervals are of equal size and do not overlap.

9. About 12 people 15. Find frequency of each interval and add them together 16. no; about 9 people saw either 6 or 7 movies

10. Venn Diagram – shows the relationship between sets of items. each set is represented separately items that belong to both sets are represented by the intersection

12. Fleas Ticks 14 26 13 26 13 22

14. 18 12 23 10 5 40

15.  spreadsheet – a tool for organizing and analyzing data  cell – a box where the column and row of spreadsheet meet. The letter and number are used to identify each cell.

17. Lawn mowing $62 yes

19. 125 C2 51 tickets Friday had the greatest overall attendance, but Saturday had greatest number of adults attend.

20.  double bar graph– a graph that uses bars to compare two sets of data  legend – a key that identifies data that are compared.  double line graph– graph that compares changes in two sets of data over time

22. 2004

23.  double line graph– graph that compares changes in two sets of data over time

24. Intersect 2005 About 130 million

26.  Stem and leaf plot – graph that uses digits of each number to show the data distribution  stem – digit or digits on the left  leaf – digit or digits on the right

31. 2 males 56 in; 50 in 70 inch No, median is 58.5 in yes, mode is 65 in Yes, 76-56 = 20

32.  Population – group of objects or people  sample – part of the population  random sample – when each member of population has the same chance of being selected

36. a.Not a random sample; may get only people shopping after work b.Random sample; you won’t get just people shopping after work

38. Random sample; selected students represent the population Not random sample; students who use vending machine may not represent all types of students

39.  biased question – question that makes some answers appear better than others or makes an unjustified assumption

40. fair Biased; Do you prefer hardwood floors in your home?

42. fair Biased; how many serving of fruits and vegetables do you eat? Biased; do you prefer thick carpeting? Biased; does tv news portray life accurately?

43. To estimate population size researchers use the capture/recapture method. They collect, mark, and release animals. Then they capture another group of animals. Marked animals in second group indicates population size.

47. 40 1968 948 4410 585 158

49. 435 animals 1450 animals 2075 animals 151 animals 625 animals 1260 animals 4033 animals 2357 animals

51. 4109 ducks 1744 alligators

56. First, find mean, median, and mode of the science exams

57. First, find mean, median, and mode of the science exams mean – 84, median – 83, mode - 76 a.Mean; it is the highest b.Mode; it is the lowest

58. Appropriate Graphs – Notes _____________ - used to compare data Types: 1. ___________ - compares two sets of data 2. ___________ - compares intervals of data; great for large amounts of data; labels in the bars are consecutive groups of numbers; bars touch ______________ - uses pictures or x’s to represent data. Also compares data like a bar graph. Easy to read and visual. ______________ - used to show change over time (years, hours, etc.) ______________ - (pie chart) – used to show part to whole; great for showing percentages. ______________ - uses the digits of each number to organize and display a set of data. ______________ – uses circles to show sets of data overlap

59. Appropriate Graphs – Notes ______graph_______ - used to compare data Types: 1. __double_bar________ - compares two sets of data 2. ____histogram_______ - compares intervals of data; great for large amounts of data; labels in the bars are consecutive groups of numbers; bars touch _____pictograph_or line plot________ - uses pictures or x’s to represent data. Also compares data like a bar graph. Easy to read and visual. ______line________ - used to show change over time (years, hours, etc.) _______circle_______ - (pie chart) – used to show part to whole; great for showing percentages. ___stem and leaf___________ - uses the digits of each number to organize and display a set of data. ______venn diagram________ – uses circles to show sets of data overlap

61. Scatter Plot: a graph that shows the relationship between two sets of data. Graph data as ordered pairs to make scatter plots.

63. positive No trend negative

65. No trend negative positive No trend negative No trend