The idea that nongenetic factors can influence how genes behave is referred to as "polygenic" influences

A problem with longitudinal studies is that they ______

a. take longer to run than cross-sectional studies b. don't distinguish age differences from cohort differences c. are less trustworthy than either biographical or cross-sectional studies d. don't track long-term changes among individuals in the study

Underlying the use of the one-sample t test is the assumption that the _____

a. distribution of scores in the sample is symmetrical b. population variance is equal to the sample variance c. degrees of freedom are greater than 30 d. scores in the population are normally distributed