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
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 cr
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
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 distributio
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
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 wit
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 =
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 u
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 chara