Researchers collected data to examine the relationship betweenpollutants and preterm births in Southern California. During thestudy air pollution levels were measured by air quality monitoringstations. Specifically, levels of carbon monoxide were recorded inparts per million, nitrogen dioxide and ozone in parts per hundredmillion, and coarse particulate matter PM10 in ??g/m3.Length of gestation data were collected on 143,196 births betweenthe years 1989 and 1993, and air pollution exposure duringgestation was calculated for each birth. The analysis suggestedthat increased ambient PM10 and, to a lesser degree, COconcentrations may be associated with the occurrence of pretermbirths.
a. The paragraph above describes an
A. Observational Study
B. Experiment
b. The cases in this research are
A. Each year between 1989 and 1993
B. Each type of pollution measured by air qualitymonitoring stations
C. Each birth between 1989 and 1993
D. Air pollution exposure during gestation
c. What is the research question?
A. How can expectant mothers avoid airpollution?
B. How much air pollution is there in SouthernCalifornia?
C. How prevalent was preterm birth during theyears 1989 to 1993?
D. Are preterm births associated with airpollution levels?
d. What is the population of interest?
A. All air quality monitoring stations
B. All years for which air quality has beenmeasured
C. All human babies
D. All environmental pollutants
e. What is the sample?
A. The 143,196 births
B. All air quality monitoring stations
C. The pollution measurements for the 4pollutants
D. The years between 1989 and 1993
f. Can the findings of this study be used toestablish casual relationships?
A. No, because this is an observationalstudy
B. Yes, because air pollution is bad for humanhealth
C. No, because this is an experiment
D. Yes, because the sample size is so large
need help no clue what i am doing wrong?
