Formula Sheet - Biostatistics Midterm 1
M
X
N
2
SD 2
( X )
N
2
( X )
N
2
( X M )
N1
(X ) 2
N
N
(X ) 2
X
N
N
2
2
(Numerator
X )
Note:
is SS
2
2
( X M ) 2
SD
N1
X
z
2
X 2
2
X
SD
N
N1
( X ) 2
X
N
SD
N1
2
SEM p
N

ACTIVITY 3-1
1. The scores (i.e., head measurements) should be identical. Any differences in scores are
created by measurement error. People are not measuring the head in exactly the same way
which creates measurement error.
2. To reduce variability due t

ACTIVITY 4-1
1. Be sure the values are located correctly on the graph. Use the raw score number line to place
each X value.
2. Any deviation greater than the standard deviation of =.6 is greater than typical. Any
deviation that is substantially greater th

9/14/2016
Dr. Harris - Biostatistics
1
Dr. Harris - Biostatistics
2
Learning Objectives
Compute the mean, median and mode.
Identify when to use the mean, median or mode when
describing a distributions central tendency.
CENTRAL TENDENCY
Introduction to S

9/13/2016
Interest Inventory
Introduction to Statistics:
An Active Learning Approach
TR5100 Biostatistics
Professor: Cristen Harris,
PhD, RDN, CSSD, CD, CEP, FAND
Learning Objectives
Explain the value of statistics for your future career.
Explain the va

ACTIVITY 2-1
1. Frequency bar graph of the data.
2. Answers are in the activity in the paragraph after question 3.
3. Answers are in the activity in the paragraph after question 3.
4. The mode is the only option because it is nominal data. It is fine as a

9/15/2016
LEARNING OBJECTIVES PART 1
Compute and interpret a z-score for a given raw score.
Solve for X if given a z-score.
Explain what the sign and value of a z-score indicates.
Locate a z-score within a distribution.
Use a normal table to determine the

ACTIVITY 1-1
1.
2.
3.
4.
5.
B
statistics, parameters, sampling error
C
B
X
10
9
8
7
6
5
4
3
2
1
0
6.
7.
8.
9.
f
0
0
1
3
2
7
5
8
1
1
0
C. N = 28 (add up the frequencies in the f column)
B. 6
B. 22/28 = 78.57%
Most practitioners performed at or below chance

9/14/2016
LEARNING OBJECTIVES
CHAPTER 3:
VARIABILITY
TR5100
Biostatistics
Dr. Harris
Explain what the standard deviation measures.
Compute the variance and standard deviation for both a
population using a calculator.
Compute the variance and standard d

9/13/2016
Classifying Variables
In-Class Activity
Dr. Cristen Harris
Review with your group the tables provided
Identify each variable as:
Note that most are Table 1
All are baseline/demographic characteristics and
descriptive statistics.
Discrete or Cont