A high school teacher conducted a test of a new approach to teaching math. Students were given a pretest when their math class began and a posttest at the end of the semester. The students' math performance improved. The teacher learned near the end of the semester, however, that in their science classes the students were using new computer software that included much of the math the teacher covered in his course. Which of the following threats to internal validity does the new computer software represent?
A. selection
B. regression
C. history
D. testing
C. history
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If a set of exam scores forms a negatively skewed distribution, it suggests that the majority of the students did not score well on the exam
Indicate whether the statement is true or false
If you drop a pencil randomly on a scatterplot, what aspect are you changing as you rotate the pencil about the point where it crosses the Y axis?
a. the slope. b. the intercept. c. the correlation. d. the residual.
During early development, the nervous system develops from which outer germ layer?
a. the endoderm b. the mesoderm c. the ectoderm d. the blastoderm
Byron is a White male who has been charged with the robbery of a bank; Oliver is a Black male who has been charged with the robbery of a bank. In both cases, the crimes were not very successful as each only managed to get away with a few hundred dollars in marked bills (the marked bills led to their capture). Given these two scenarios, Oliver is likely to get the longer sentence
Indicate whether the statement is true or false