An experimenter is interested in the influence of taking a one-semester-long test preparation course on performance on the Scholastic Aptitude Test (SAT). She contacts high school students who have and who have not taken the course and compares their scores on the SAT exam. She finds that the students who have taken the course score significantly higher on the test. Which of the following represents the principal threat to the internal validity of this experiment?
a. Regression to the mean
b. Maturation
c. Selection
d. Attrition
Question 2
An experimenter is interested in the influence of taking a one-semester-long test preparation course on performance on the Scholastic Aptitude Test (SAT). She contacts high school students who have and who have not taken the course and compares their scores on the SAT exam. She finds that the students who have taken the course score significantly higher on the test. The appropriate statistical test is
a. descriptive statistics.
b. Pearson correlation.
c. chi-square.
d. one-way ANOVA.
Associative Long-Term Potentiation
Schamroth test A. Healthy nail B. Clubbing
Correlations between scores on a psychology test and number of boiled kumquats eaten per month
Helgeson Company has identified the following items for possible inclusion when taking a ...
A reciprocal translocation involving the long arms of chromosomes
If the following ions Ca2+, Cl-, Na+ and CO32- are placed in a test tube, the precipitate ...