Select all scenarios which demonstrate the use of a cross-sectional study.

Answer

a.A patient with condition gets her blood tested every six months to ensure that hormone levels are not rising.

b.An electric company wants to determine their peak hours of usage. so they review their data for energy demand over the past two years.

c.A budget-conscious person checks the local grocery store circular ad to find the best price on the items on his shoppinh list

d.A principal wants to determine the number of current students in her high school who plan to attend college