A plant physiologist was studying the relationship between intercepted solar radiation and plant biomass produced over the growing season. Several experimental plots under different growing conditions...

A plant physiologist was studying the relationship between intercepted solar radiation and plant biomass produced over the growing season. Several experimental plots under different growing conditions were monitored for radiation. Several times during the growing season biomass samples were taken from the plots to measure growth. The resulting data for each experimental plot showed cumulative solar radiation and biomass for the several times the biomass was measured during the season. Would you expect the dependent variable, biomass, to have constant variance over the growing season? Would you expect the several measurements of biomass on each plot to be statistically independent? Would you expect the measurements from different random experimental units to be statistically independent?