Question

5. Determine whether the given description corresponds to an experiment or

observational study.

a. A stock analyst selects a stock from a

group of twenty for investment by

choosing the stock with the greatest

earnings per share reported for the

last quarter.

b. A marketing firm does a survey to find out

how many people use a product. Of the one

hundred people contacted, fifteen said

they use the product.

c. A political pollster reports that his

candidate has a 10% lead in the polls

with 10% undecided.

d. A doctor gives a new medication to half of

his patients with the flu and a placebo to

the other half of his patients with the flu.

6. Identify the type of study (cross-sectional, retrospective, prospective)

a. Researchers collect data by

interviewing athletes who have won

Olympic gold medals from 1992 to 2016.

b. A town obtains current employment data

by polling 10,000 of its citizens this

month.

c. A researcher obtains data by searching

through the medical records of 500

men who died of lung cancer

d. A researcher collects data on the progress

of a group of women who diagnosed with

breast cancer 10 years ago.

Answer 1

Answer 5. Determine whether the given description corresponds to an experiment or observational study.

a. A stock analyst selects a stock from a group of twenty for investment by choosing the stock with the greatest earnings per share reported for the last quarter.

observational study because it is based on observation of report for the last quarter.

b. A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product.

Observational study as it is based on only observation not any treatment.

c. A political pollster reports that his candidate has a 10% lead in the pollswith 10% undecided.

Observational study as it is based on collected data.

d. A doctor gives a new medication to half of his patients with the flu and a placebo to the other half of his patients with the flu.

Experimental study as people divided in two groups to give different treatment.

Answer 6: Identify the type of study (cross-sectional, retrospective, prospective)

a. Researchers collect data by interviewing athletes who have won Olympic gold medals from 1992 to 2016.

Retrospective study because the researcher interviewed who have won from past years.

b. A town obtains current employment data by polling 10,000 of its citizens this month.

Cross-sectional study.

c. A researcher obtains data by searching through the medical records of 500 men who died of lung cancer

Prospective study.

d. A researcher collects data on the progress of a group of women who diagnosed with breast cancer 10 years ago.

Retrospective study because the researcher collect data from the past 10 years.

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