Question

Use software or a calculator to find the​ range, variance, and standard deviation of the​ F-scale measurements from the tornadoes listed the data set available below. Be careful to account for missing data. PLEASE HELP!!

F SCALE LENGTH (MI) WIDTH (YD)
2 39.8 400
1 5 100
2 0.06 100
2 0.1 200
2 9 400
2 14.4 50
0 4.2 50
1 1.52 30
0 10.01 25
0 0.09 50
1 0.2 20
3 6.42 300
5.73 40
0 1.75 50
3 15 100
1 0.5 200
0 0.15 10
0 0.38 30
1 0.28 50
0 57 50
0 2.87 50
0 0.21 30
1 29.6 10
2 6 100
1 2 50
4 28.01 800
7.1 100
4 2.29 350
0 0.56 150
1 1 50
1 1 100
1 0.5 20
0 2.52 50
0 0.51 70
0 0.5 50
1 2.4 450
0 4.09 50
1 2 150
1 0.6 80
1 5 75
0 0.8 27
1 0.26 75
2 6 400
0 3.2 60
3 5.7 1200
0 0.16 50
1 21 100
0 1.83 100
3 3.5 150
0 1 50

Answer 1

a) Range = 4

b) Variance = 1.274823

c) standard deviation = 1.12908

Explanation:

The first step is to extract the f scale values from the list of value. Note that there are 2 missing values cases in f scale dataset. The moment you are able to extract the values. Other procedures are simple.

If you are familiar with R programming, try this on your own.

##########################################

fscale = c(2,1,2,2,2,2,0,1,0,0,1,3,0,3,1,0,0,1,0,0,0,1,2,1,4,4,0

,1,1,1,0,0,0,1,0,1,1,1,0,1,2,0,3,0,1,0,3,0)

length(fscale) # . this tells us the number of observations that f scale has.

range(fscale)

var(fscale)

sd(fscale)

############################################

If you do this, your range value with give [0, 4]. Which means the minimum value is zero (0) and the maximum value is four (4). When you take the difference, you have 4.