After volunteering for an experimental study, nora is included into a group of 30-year olds. she finds that there are other groups having people both younger and older than her. the study's results show that the mental scores of the younger lot are higher than the rest. nora was part of a

I believe the answer is: cross-sectional study

cross-sectional study refers to a type of observational study that use a group of subject from a population with a specific characteristic from a specific point of time. This type of study is usually used to assess the prevalence of acute or chronic conditions and not the perfect type to be used to find a causal relationship between variables,.

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.  

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "