ITT 702-01 STATISTICAL METHODS FOR INFO TECHNOLOGY
ANALYSIS ASSIGNMENT 2

QUESTIONS

1. Determine the range, standard deviation, and variance for the indicated data set.

a. SET A

b. SET B

c. SET C

d. SET D

e. SET E

f. SET F

Set A Ages of people that attended an Alcoholics Anonymous (AA) therapy session: 25, 44, 20, 37, 56, 51, 34, 41, 36, 61, 33, 31, 47, 63, 67 Range = 67-20 = 47 Mean = 43.07 (X-U)^2 = 2816.933

Standard Deviation = 53.074

Variance = 187.7956

SET B Grades on the second test of ECT 120 class: 77, 80, 87, 67, 88, 77, 12, 93, 78, 44, 71, 86, 40, 100, 76, 83, 66, 62, 89, 79, 81, 52, 30, 71, 76, 100, 74, 65, 82, 100, 56, 35, 51, 59, 29,13, 71 Range = 100-12=88 Mean = 67.57 (X-U)^2 = 18919.08 Standard Deviation = 137.547

Variance = 511.327

SET C Number of defective resistors per package of 100: 5, 10, 3, 2, 1, 9, 4, 10, 5, 3, 5, 5, 7, 11, 20

Range = 20-1 = 19, Mean = 6.67, (X-U)^2 = 323.333,
Standard Deviation= 17.9815, Variance = 21.5556

SET D States within the USA with National Parks: STATE
Number of National Parks
Alaska
8
Arizona
3
Arkansas
1
California
8
Colorado
2
Florida
3
Hawaii
2
Idaho
1
Kentucky
1
Maine
1
Michigan
1
Minnesota
1
Montana
2
Nevada
2
New Mexico
1
North Carolina
1
North Dakota
1
Oregon
1
South Dakota
2
Tennessee
1
Texas
2
Utah
5
Virginia
1
Washington
3
Wyoming
2

Range = 8-1 = 7, Mean = 2.24, (X-U)^2= 94.56, Standard deviation = 9.7242

Variance = 3.94

SET E Normal Monthly recipitation in Miami Florida. Data taken over 30 years from 1961- 1990.

Month
Precipitation
Inches (in.)
January
2.01
February
2.08
March
2.39
April
2.85
May
6.21
June
9.33
July
5.70
August
7.58
September
7.63
October
5.64
November
2.66
December
1.83

Range = 7.5, Mean = 4.245, (X-U)^2 = 79.7759, Standard Deviation = 8.931,

Variance = 7.065

SET F Annually Year Precipitation in selected US Cities. Data taken over 30 years from 1961- 1990.

City
Precipitation
Inches (in.)
New York City
47.25
Dodge City, KS
21.49
Detroit, MI
32.62
Honolulu, HI
22.02
Atlanta, GA
50.77
Hilo, HI
129.19
Tallahassee, FL
65.71
Orlando, FL
48.11
Bakersfield, CA
5.72
Alamosa, CO
7.57
Chicago, IL
35.85
Los Angeles, CA
14.77
Bridgeport, CT
41.66
New Orleans, LA
61.88
Las Vegas, NV
4.13
Binghamton, NY
36.99
Dallas, TX
33.70
Houston
46.07
Seattle
38

Range =125.06, Mean = 39.132, (X-U)^2 = 14294.56, Standard deviation = 199.56,

Variance = 794.1425

2. Jacklyn scored