Exam I

Question 1

data

Answer 1

points classified by variables

Question 2

variable

Answer 2

characteristic of object

• qualitative
• quantitative

Question 3

qualitative

Answer 3

categorical

sex, treatment groups, ethnicity

Question 4

quantitative

Answer 4

numerical

weight, height, bp

Question 5

categorical

Answer 5

nominal

ordinal

Question 6

quantitative

Answer 6

interval

ratio

Question 7

nominal

Answer 7

no order

y/n, m/f, white/black/hispanic

Question 8

ordinal

Answer 8

ranked to give order

mild/moderate/severe, poor/fair/good/excellent

Question 9

interval

Answer 9

level clearly defined by distance bw variables

pH, C

Question 10

ratio

Answer 10

values equally spaced w an absolute zero point

weight, K

Question 11

discrete vs. continuous

Answer 11

whole #s vs decimals

people vs time

Question 12

statistic

Answer 12

measure of sample

calculated

Question 13

parameter

Answer 13

measure of population

inferred

Question 14

descriptive statistics

Answer 14

summarize sample of population

Question 15

inferential statistics

Answer 15

use sample statistics to infer about population

Question 16

of intervals

Answer 16

k=1+3.322log(n)

round up

Question 17

interval width

Answer 17

w=range/k

Question 18

histogram distribution

Answer 18

symmetric
left tail/negative skew
right tail/positive skew
bimodal

Question 19

measures of central tendency

Answer 19

mean
median
mode

Question 20

measures of dispersion (variability/spread)

Answer 20

range
variance
standard deviation
coefficient of variation
mean absolute deviation

Question 21

variance

Answer 21

s^2=Z(x-mean)/n-1

Question 22

coefficient of variation

Answer 22

CV=s/mean*100%

Question 23

mean absolute deviation

Answer 23

MAD=Zabs(x-mean)/n

Question 24

percentile

Answer 24

pth percentile=p(n+1)/100

Question 25

interquartile range

Answer 25

IQR=Q3-Q1

Question 26

symmetric box & whisker

Answer 26

mean=median

Question 27

skewed box & whisker

Answer 27

left: mean < median
right: mean > median

Question 28

outlier

Answer 28

> Q3+1.5IQR

<Q1+1.5IQR
outside 3s from mean

Question 29

numerical summary

Answer 29

min, Q1, Q2, Q3, max
symmetric/no outliers: n, mean+-std
skewed/outliers: n, mean+-IQR