Characteristics of water resources (and other
natural systems) data
lower bound of zero
no negative values are possible
presence of outliers
observations considerably higher or lower than most of
the data
high outliers more common in water resources

CVEG 563 Stat Apps Homework #1
CVEG 563 Stat Apps
Homework #1
Problem 1.
uses data file: Train.xls (which is just the 10 data points shown below)
For the last 10 days in June, the Shore Special train was late arriving at its destination by the following
t

Graphical data analysis
computing statistical measures
without looking at a plot is an
invitation to misunderstanding data
histograms
visual impression can depend on # of
categories selected, bar width, and
centers
good for large differences in shape

Descriptive Stats
median: middle value
half above half below
order the data
median is middle value
or halfway between two middle values
resistant to outliers
works for different distributions
mode: value most frequently
encountered
modal class: c

CVEG 563 Stat Apps
CVEG 563 Stat Apps
Homework #2
Text Problems:
3.44
3.57
3.63
2.46
3.90
3.95
Use the data FISH.XLS and calculate:
- box and whisker plots for weight, DDT, and log-transformed DDT by hand, excel, MiniTab, JMP, other
- 6 normal probability

Probability
Flip a coin
probability of head = 0.5 (50%)
probability of tail = 0.5 (50%)
Flip 10 times
exactly 5 heads, 5 tails?
Probably close to 5
probably exactly 5?
Summing and multiplying probabilities
Flip coin 3 times
P(3 heads) =
P(3 heads

CVEG 563 Stat Apps
CVEG 563 Stat Apps
Homework #3
1. Text problem 4.9
2.
The Journal of Engineering in Industry (Aug. 1993) reported on an automated system designed to replace the
cutting tool of a drilling machine at optimum times. To test the system, da

Intro: statistics and data
Definitions
statistics: science of data
statistic: measurement
data: plural of datum, number,
information
experimental unit: object upon
which we collect data
variable: something that varies
quantitative: has a number
qua