Chapter 4 Residents in South Norfolk suspect they have an unusually high number
ID: 3069576 • Letter: C
Question
Chapter 4
Residents in South Norfolk suspect they have an unusually high number of fires compared to the surrounding area. To investigate this, they look at the average number of fires in the entire Hampton Roads regions (this is our population because we don’t care about other regions). Use the following table to calculate these measures of variance.
City
Average fires/week
Deviation
Squared Deviation
South Norfolk
15
Norfolk
9
Virginia Beach
4
Chesapeake
7
Newport News
10
Hampton
6
Lab continues on the next page!
4.1 In the table above, what is (Mu)?
4.2 Calculate the Deviation for each score (show work by putting numbers in table)
4.3 Calculate the Squared Deviation for each score (show work by putting numbers in table)
4.4 What is the Variance?
City
Average fires/week
Deviation
Squared Deviation
South Norfolk
15
Norfolk
9
Virginia Beach
4
Chesapeake
7
Newport News
10
Hampton
6
Explanation / Answer
Ans:
4.1)
Mean(Mu)=51/6=8.5
4.2,4.3)see above table
4.4)Variance=73.5/6=12.25
City Average fires/week(x) Deviation=x-8.5 Squared Deviation=(x-8.5)^2 South Norfolk 15 6.5 42.25 Norfolk 9 0.5 0.25 Virginia Beach 4 -4.5 20.25 Chesapeake 7 -1.5 2.25 Newport News 10 1.5 2.25 Hampton 6 -2.5 6.25 Total= 51 73.5 Average= 8.5 Variance= 12.25Related Questions
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