Biostatistics Assign 1

Show your work in detail

Chapter I

1.11. Classify each of the following variables as quantitative, ordinal, or categorical.

(a) White blood cells per deciliter of whole blood

(b) Leukemia rates in geographic regions (cases per 100,000 people)

(c) Presence of type II diabetes mellitus (yes or no)

(d) Body weight (kg)

(e) Low-density lipoprotein level (mg/dl)

(f) Grade in a course coded: A, B, C, D, or F

(g) Religious identity coded 1 = Protestant, 2 = Catholic, 3 = Muslim, 4 = Jewish, 5 =

Atheist, 6 = Buddhist, 7 = Hindu, 8 = Other

(h) Blood cholesterol level classified level as either 1 =hypercholesterolemic, 2 =

borderline hypercholesteromic, 3 = normocholesterolemic

(i) Course credit (pass or fail)

(j) Ambient temperature (degrees Fahrenheit)

(k) Type of life insurance policy: 1 = none, 2 = term, 3 = endowment, 4 = straight life, 5

= other

(1) Satisfaction: 1 = very satisfied, 2 = satisfied, 3 = neutral, 4 = unsatisfied, 5 = very

unsatisfied

(m) Movie review rating: 1 star, 11/2 stars, 2 starts, 21/2 stars, 3 stars, 31/2 stars, 4 stars

(n) Treatment group: 1 = active treatment, 2 = placebo

1.12. Rating hospital services . A source ranks hospitals based on each of the following

items. (The unit of observation in this study is “hospital.”) Identify the measurement

scale of each item as quantitative, ordinal, or categorical.

(a) Percentage of patients who survive a given surgical procedure.

(b) Type of hospital: general, district, specialized, or teaching.

(c) Average income of patients that are admitted to the hospital.

(d) Mean salary of physicians working at the hospitals.

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Chapter II

I. Table 1 lists all students in the biostatistics class, Spring 2015.

01 Abreu,Luis G

02 Baez,Anelsy

03 Bediako,Francis

04 Bega,Marinela

05 Benn,Alonica A

06 Bennett,Aliya

07 Berrios,Krystal G

08 Collins,Candice S

09 Dealoe,Joseph

10 Diaz,Abigail

11 Encarnacion,Janeliza

12 Guilamo,Yarisme

13 Ibitoye,Abiola E

14 Jaskulek,Jacqueline F

15 Martinez,Celeste P

16 Mclarty,Seymone I

17 Menendez,Robert

18 Mirando,Mikayla

19 Musah,Shirazu A

20 Pierre,Irma Christina

21 Rivera,Jennifer

22 Rivera,Milissa

23 Stewart,Marie

24 Swanson,Katelyn

25 Watson,Ghislaine L

1. Select a simple random sample of size 4 from HSD269-XM81 population by entering the table

of random digits (Table A) in row 12. What is a random sample?

2.4. Explanatory variable and response variable . Identify the explanatory variable and response

variable in each of the studies described here.

(a) A study of cell phone use and primary brain cancer suggested that cell phone use was not

associated with an elevated risk of brain cancer.

(b) Records of more than three-quarters of a million surgical procedures conducted at 34 different

hospitals were monitored for anesthetics safety. The study found a mortality rate of 3.4%

for one particular anesthetic. No other major anesthetics was associated with mortality

greater than 1.9%.

(c) In a landmark study involving more than three-quarters of a million individuals in the United

States, Canada, and Finland, subjects were randomly given either the Salk polio vaccine

or a saline (placebo) injection. The vaccinated group experienced a polio rate of 28 per

100,000 while the placebo group had a rate of 69 per 100,000. A third group that refused

to participate had a polio rate of 46 per 100,000.

2.5. Experimental or nonexperimental? Determine whether each of the studies described in

Exercise 2.4 are experimental or nonexperimental. Explain your reasoning in each

instance.

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