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Misleading Graphs and Statistics

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1 Misleading Graphs and Statistics
4-6 Misleading Graphs and Statistics Warm Up Problem of the Day Lesson Presentation Pre-Algebra

2 1. What is the least popular fruit?
Pre-Algebra 4-6 Misleading Graphs and Statistics Warm Up 1. What is the least popular fruit? 2. How many students answered the survey? kiwi 90

3 Graphs and statistics are often used to persuade
Graphs and statistics are often used to persuade. Advertisers and others may accidentally or intentionally present information in a misleading way.

4 Explain why each graph is misleading.
The graph suggests that the stock will continue to increase through 2020, but there’s no way to foresee the future.

5 Explain why each graph is misleading.
Because the scale leaves out 0 to 100, the bar heights make it appear that the sixth grade sold about three times as many tickets as either of the other two grades.

6 Explain why each graph is misleading.
The scale is so compressed that it’s hard to see any difference among the brands.

7 % of Return on Investment
Explain why each graph is misleading. % of Return on Investment 60 50 40 30 * projected 20 10 1 2 3 4 5* 6* The graph suggests that the rate of investment return will continue to increase, but there are no guarantees

8 Preferred Juice Flavors
Explain why each graph is misleading. Preferred Juice Flavors The graph appears to indicate that significantly more people prefer grape drink over the others when in fact there is a small margin of difference. (0 to 140 is not graphed) 150 148 146 144 142 140 Grape Cherry Apple

9 Explain why each graph is misleading.
Drink Sales This graph is too compressed to see much difference between the brands indicating that they are fairly equal. 120 No data from 50 to 120 100 80 60 40 20 Brand X Brand Y Brand Z

10 B. Four out of five dentists surveyed preferred UltraClean toothpaste.
Explain why each statistic is misleading. A. Sam scored 43 goals for his soccer team during the season, and Jacob scored only 2. Although Jacob scored only 2 goals, he may have played most of his time on defense. B. Four out of five dentists surveyed preferred UltraClean toothpaste. This statement does not give the sample size or state what UltraClean toothpaste was compared with.

11 Shopping at Save-a-Lot can save you up to $100 a month!
Explain why each statistic is misleading. Shopping at Save-a-Lot can save you up to $100 a month! The words save up to $100 mean that the maximum you can save is $100, but there is no guarantee that you will save that amount.

12 Fruity Squares makes the cereal 100% more fun.
Explain why each statistic is misleading. Four out of five breeders recommend Pet Blend dog food for a healthier coat. This statement does not give the sample size or state what Pet Blend dog food was compared with. Fruity Squares makes the cereal 100% more fun. You cannot measure how much fun Fruity Squares makes the cereal.

13 The states have different populations and climates.
Explain why each statistic is misleading. The total revenue for bathing suits sold in May at Worthman’s Florida stores is 250,000. The total revenue for bathing suits sold in May at Worthman’s North Dakota stores is 10,000. The states have different populations and climates.

14 Lesson Quiz: Part 1 Explain why each graph or statistic is misleading 1. Possible answer: The size of the trucks is larger than the size of the cars, so it looks like there are as many trucks as cars, although there are 6 cars and 4 trucks.

15 Lesson Quiz: Part 2 Explain why each graph or statistic is misleading 2. A budget area of a used-car lot has five cars on it, with prices of $4200, $4700, $4900, $5200, and $900 (a wrecked one). The car ad in the local paper reads “Average priced car on budget lot is $3980.” The wrecked car’s price brings the average down. Without using the price of the wrecked car, the average price would be $4750.

16 Solve and check ; 7.5 = 5h 7.5 = 5h 1.5 = h 7.5 = 5h 7.5 = 5(1.5) 7.5 = 7.5

17 Homework Pg 202; 1 – 11all 14 – 17 all


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