Nokea
The geometric mean is the value that:
- A. Is midway between the lowest and highest value on a log scale
- B. Occurs most often on a log scale
- C. Has half the observations below it and half above it on a log scale
- D. Is statistically closest to all of the values in the distribution on a log scale
Correct Answer: A
Rationale: Geometric mean finds the central tendency for a set of numbers by using the product of their values.
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SAP stands for
- A. reducing public sector subsidy
- B. increasing public sector subsidy
- C. increasing government sector subsidy
- D. none
Correct Answer: A
Rationale: Structural Adjustment Programs (SAPs) often aim at reducing public sector subsidies.
The balancing equation is
- A. P1+(B-D)+(I-E)=P2
- B. P1-(B-D)-(I-E)=P2
- C. P2+(B-D)+(I-E)=P1
- D. P1+P1(B-D)+P1(I-E)=P2
Correct Answer: A
Rationale: The balancing equation for population change is P1 + (B-D) + (I-E) = P2, where B is births, D is deaths, I is in-migration, and E is out-migration.
A random-digit dialed survey conducted in the City of Long Beach, California, reported that a greater proportion of nonsmokers endorsed a ban on smoking in alcohol-serving establishments than did smokers. What type of study design was this?
- A. Cross-sectional study
- B. Case-control study
- C. Ecologic study
- D. Cohort study
Correct Answer: A
Rationale: This is a cross-sectional study as it captures attitudes at one point in time without follow-up.
Which of the following is unrelated to the chi square test of significance?
- A. Degree of freedom
- B. Life table
- C. Significance level
- D. Qualitative data
Correct Answer: B
Rationale: Life tables are not directly related to chi-square tests, which assess qualitative data associations.
30 babies were born in hospital, 10 were less than 2.5 kg and 20 were greater than 2.5 kg the average is
- A. Arithmetic mean
- B. Median
- C. Geometric mean
- D. Mode
Correct Answer: B
Rationale: The median divides the data into two equal parts, making it suitable here.