Describing Distributions Flashcards
If the graph of your data is skewed, what center and measure of spread should you use?
Center: Median
Measure of Spread: IQR
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Pie Chart
What type of graph would you make with this information?
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Ogive
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Dot Plot
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Bar Graph
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Histogram
What is mean; its equation?
The average; the sum of the data divided by the number of numbers.
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What is a median?
The middle # when the numbers are in numerical order.
How do you find the outliers in a set of data?
Low outliers: Q1-(1.5*IQR)
High outliers: Q3+(1.5*IQR)
True or False. When looking at the United States, the city of New York is a population.
False
What is the value of correlation for operating cost per hour and number of passenger seats in the plane? Interpret the correlation.
r=0.75
There is a strong positive linear relationship between the operating cost per hour and the number of passenger seats on the plane.
Practice Problem A copy machine dealer has data on the number x of copy machines at each of 89 customer locations and the number of y service calls in a month at each location. It was given that r=0.86. What percent of the variation in number of service calls is explained by the linear relation between number of service calls and number of machines?
A. 86%
B. 93%
C. 74%
D. None of these
E. Can’t tell from the information given
C. 74% The question is asking for r2 and since r=0.86, you would square 0.86 and get 0.74.
What is a qualitative variable?
A variable that describes non numerical values.
What are the two types of qualitative graphs covered in class?
Pie Chart
Bar Graph
What is a Quantitative variable?
A numerical variable that represents a measurable quantity.
What are the four types of quantitative graphs covered in class?
Stem Plot
Histogram
Dot Plot
Ogive