Question

Researchers collected volunteers for a study of women who had recently given birth, divided into 2 groups: a comparison group (healthy, uneventful pregn group with gestational diabetes (women who developed diabetes during pregnancy). All the women were between 25 and 40 years old. Also measured for each woman was: - Body Mass Index (BMI) pre-pregnancy (continuous numerical) - Smoker (Yes/No: categorical) - Baby's gestational age at birth in weeks (continuous numerical) - Baby's birth weight in grams (continuous numerical) Enter answers as a single identifying letter, i.e. A (a) What kind of study design is this? A. cohort survey B. simple random survey C. cluster survey D. stratified survey E. case-control survey

Answer 1

1)

a) This is the case of Case-Control study design because of the researcher made two groups. One is who was exposed to the factor of the other is a control group.(E)

b) Two sample t-test would be used to test the difference between groups beause the variable is coutinus.(C)

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2)

a) control/treatment study because one group is exposed to the medicine whereas other is kept at the control of the medicine. (A)

b) Chi-square test because both variables are categorical. (D)

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3)

a)  This is the case of Case-Control study design because of the researcher made two groups. One is who was exposed to the factor of the other is a control group. (E)

b) Regression(test for non-zero intercept and slope) because regression establishes the relationship between two variables (continuous outcome variable).(F)

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4) Both may or may not be a causal relationship because correlation tells the degree of linear realtion between x and y but it does not tells about causal relationship.(A)