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

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Presentation on theme: " frequency table – table that lists each item in a data set and number of times each item occurs."— Presentation transcript:

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

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4  line plot – 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 – bar graph with no spaces between the bars. Height of each bar shows frequency of data. Intervals are of equal size and do not overlap.

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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 relationship between sets of items. each set is represented separately items that belong to both sets are represented by the intersection

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12 Fleas Ticks 14 26 13 26 13 22

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14 18 12 23 10 5 40

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

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17 Lawn mowing $62 yes

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

20  double bar graph– graph that uses bars to compare two sets of data  legend – key that identifies data that are compared.

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22 2004

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

24 Intersect 2005 About 130 million

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

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30 2 males 56 in; 50 in 70 inch No, median is 58.5 in yes, mode is 65 in Yes, 76-56 = 20

31  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

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

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

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

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

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41 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?

42 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.

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46 40 1968 948 4410 585 158

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48 435 animals 1450 animals 2075 animals 151 animals 625 animals 1260 animals 4033 animals 2357 animals

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50 4109 ducks 1744 alligators

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55 First, find mean, median, and mode of the science exams

56 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

57 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

58 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

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