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.
How long does it take you to see the circles?
Using the voltmeter leads from a starting and charging test unit to measure the voltage drop ...
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