Answer key swish and Spit Worksheet



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http://www.nidcr.nih.gov/NR/rdonlyres/2C0002BC-BB25-442C-BF28-6FD1B11B1204/3243/rinseandspit.gif

ANSWER KEY
Swish and Spit Worksheet http://www.nidcr.nih.gov/nr/rdonlyres/2c0002bc-bb25-442c-bf28-6fd1b11b1204/3243/rinseandspit.gif

Partner Names:__________________________________________________

The researchers for the Swish and Spit Mouthwash Company, using a measuring tape, measured the distance between the corners of the closed mouths of 20 random people and record their results in millimeters on the table below. Mr. Swish believes the opening of the new single serve mouthwash containers should be equal to or slightly smaller than the lip length of most of the people the researchers studied. If the container is larger than the lip measurement, then the mouthwash will spill out of the sides and the container will not be effective.

Lip Length Data Table (in millimeters)



60

45

62

50

47

55

44

48

55

48

48

65

47

60

47

62

42

46

52

50

Work space:



Create and label box plot:



Use your box plot to answer the following questions:




The highest values begin at Q3.
The section of the graph that contains the data from the longest lips begins at which quartile?

50% of the data is on the left side of the median.
What percent of the data falls to the left of the median?


50% of the people in the study group have lip lengths between 47 mm and 57.5 mm.
What does the interquartile tell you about the lip lengths of the study group?


75% of the people in the study group would be able to use those mouthwash containers.
If Mr. Swish decided to make the opening of his mouthwash container slightly larger than 47 mm, what percent of the study group would be able to use it without spilling and wasting the mouthwash?


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