A researcher does a series of studies to see what affects motor development. In Study 1, preterm infants are compared to full-term infants on their motor development at one year of age. In Study 2, the motor development of two groups is compared: one-year-olds whose parents
Had enrolled them in "baby gymnastics" versus one-year-olds without this experience. In
Study 3, six-month-olds are randomly assigned to a group that receives extra large-motor
Stimulation (in "walkers") versus no enrichment; the two groups' large-motor skills are
Compared at twelve months.
Assuming that the test of motor development is at the interval level, which type of statistical
Test is most appropriate for each study?
Study 1:
Study 2:
Study 3:
A) correlation coefficient
B) t test
C) Wilcoxon matched-pairs
D) F test
E) Mann-Whitney U test

Question

Quizplus · Accepted Answer

Study 1 and Study 2 involve comparing two independent groups on a continuous outcome, which is best analyzed using a t-test. Study 3 involves comparing more than two groups or conditions, which would typically require an F test (ANOVA), but since only two groups are compared, a t-test is still appropriate.

A Researcher Does a Series of Studies to See What