1.
a) quantitative
b) qualitative
c) quantitative
d) qualitative
e) quantitative
f) quantitative
2.
3.
a)
103+ 68+62+60+60+54 +49+ 44+ 42+41+38+36 +34+30+19+19+ 19+19+17+16
20
827
20
Mean =41
b)
41+38 79
= =39.5
2
2
Median = 40
c) Mode= 19
d) 103-16= 87
R

Gender Kscore Boxplot
When comparing the knowledge score between genders, men have a slightly
higher knowledge score for the population we sampled. The difference was 0.01
which is not statistically significant. The men also had a larger variance of
knowl

2)
The coefficient variation (CV) is especially useful when we
dont know much about the data we have besides the mean and
SD. We can use the CV to determine how spread out our data
points are. Example if we know the SD and the mean of a data set
we can de

1. (4 points) A medical research team wishes to assess the usefulness of a
certain symptom (call it S) in the diagnosis of a particular disease. In a
random sample of 775 patients with the disease, 744 reported having the
symptom. In an independent random

(e) Calculate mean and standard deviation of K-Score for each gender.
Descriptives
Gender
Kscore
Male
Statistic
Mean
1.9250
95% Confidence Lower Bound
Interval for Mean Upper Bound
1.5258
2.3242
5% Trimmed Mean
1.8611
Median
Variance
2.0000
1.558
Std. Dev

1. (10 points) In a study of factors thought to be associated with birth weight, a simple
random sample of 100 birth records was selected from the North Carolina 2001 Birth
Registry. Three variables were extracted from each record. There are two
independe

Joseph ODell
11/16/14
MPH 520 HW 6
1.
a) H0: 1= 2= 3
1 = average systolic bp for ages under 20
2 = average systolic bp for ages 20-40
3 = average systolic bp for ages over 40
b)HA: At least one pair is not equal
c) F-statistic= 1.655
d) P-value= 0.205

1.
a) A false positive for this situation is if a patient reports having the symptom, when the patient does not
have the symptom.
b) A false negative for this situation is if the patient does not report having the symptom, when the patient
does have the s

MPH520-M70
HW 5
Please read chapter 7 sections 1-5 and do the following problems.
1) (10 points) A Study by Thienprasiddhi et al. examined a sample of 16 subjects with
open-angle glaucoma and unilateral hemifield defects. The ages (years) of the subjects