Objective: Write on the goal/objective sheet and give a before class rating. Determine the types of graphs appropriate for specific data.

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1 Objective: Write on the goal/objective sheet and give a before class rating. Determine the types of graphs appropriate for specific data. Khan Academy test Tuesday Sept th. NO CALCULATORS allowed. Not allowed to go back and make up these assignments after the test. Chapter 1 2 Test Sept. 13th or 1th (Block day) Begin the Warm Up as I take attendance: 1. A radio talk show asked listeners to respond either yes or no to the question, Is the candidate who spends the most on a campaign the most likely to win? Fifteen people called in and nine said yes. A. A. What is the implied population? B. What is the variable? C. Can you detect any bias in the selection of the sample? 2. Categorize the type of sampling used in each of the following: Random Stratified Convenience Systematic Cluster B. o C. y A. Subscribers to the magazine Sound Alive were assigned numbers. Then a sample of 30 subscribers was selected by using a randomnumber generator. The subscribers in the sample were invited to rate new compact disc players for a "What the Subscribers Think" column. B. To judge the appeal of a proposed television sitcom, a random sample of 10 people from each of three different age categories was selected and those chosen were asked to rate a pilot show. C. To conduct a preelection opinion poll on a proposed amendment to the state constitution, a random sample of 10 telephone prefixes (first three digits of the phone number) was selected, and all households from the phone prefixes selected were called. D. To conduct a study on depression among the elderly, a sample of 30 patients in one nursing home was used. E. To maintain quality control in a brewery, every 20th bottle of beer coming off the production line was opened and tested. Objective: Determine the types of graphs appropriate for specific data. Features of a bar graph: 1. Bars can be vertical or horizontal. 2. Bars are uniform in width and uniformly spaced. 3. The lengths of the bars represent values of the variable being displayed, the frequency of occurrence, or the percentage of occurrence. The same measurement scale is used for the length of each bar.. The graph is well annotated with title, labels for each bar, and vertical scale or actual value for the length of each bar. frequency letter grade Bars don't touch to emphasize that it is not numerical/ continuous *watch for breaks along the vertical axis. It makes the bars appear closer in height. Checklist title Bars separated each bar labeled frequency at top of each bar x axis labeled y axis labeled scale on y axis consistent 1

2 Pareto Chart: A bar graph presented in decreasing order of frequency of occurrence. (tallest bar on the left, shortest bar on the right.) frequency *watch for breaks along the vertical axis. It makes the bars appear closer in height. Checklist title Bars separated each bar labeled frequency at top of each bar x axis labeled y axis labeled scale on y axis consistent See page 3 of the text for an example of how the vertical page break makes the differences in the age spans amplified (appear larger). Histograms: Similar to a bar graph. Used for large amounts of quantitative data. Bars touch to show the data is continuous. 2

3 Circle graph or pie chart wedges of a circle visually display proportional parts of the total population that share a common characteristic. How long do we spend talking on the telephone after hours (at home after 5 P.M.)? The results from a recent survey of 500 people (as reported in USA Today) are shown: less than 1/2 hour 296 1/2 hour to 1 hour 3 more than 1 hour 1 1. Find the fractional part: 2. Change to a decimal: 3. Multiply by 100 to find what percent of the circle to designate for this category. label with the category and the % 3

4 less than 1/2 hour 296 1/2 hour to 1 hour 3 more than 1 hour 1 1. Find the fractional part: 2. Change to a decimal: For More Accuracy 3. Multiply decimal by 360: (this is how many degrees of the circle you nee for this part of the circle) amount of people Warning Vertical axis must go up in equal increments! Must have zero on the bottom year 20

5 assignment: p 9 (1,3,,6,9 Read carefully some of these are pareto charts) (Must have how many degrees each part of the circle represent, measure out with a protractor for extra credit) Be thinking about: If you needed to choose 100 BC students for a sample, how could you organize: a. Convenience sample b. Simple Random sample c. Cluster sample d. Stratified sample e. Systematic sample 5

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