You need to plot values of one continuous variable against two others, whilst also differentiating groups of cases with different-coloured dots. What type of scatterplot should you use?
A. Simple 3-D scatterplot
B. Grouped 3-D scatterplot
C. Scatterplot matrix
D. Grouped scatterplot
Answer: B
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Identify the threat to internal validity in each of the following:
a. Some researchers who were given rats to train were told incorrectly that the rats had been bred for intelligence; other researchers were told that their rats were especially dull. The experimenters who had the "smart" rats reported faster learning than did the experimenters with the "dull" rats. b. After the first exam, a professor divided his statistics class into high performers and low performers. The low performers were invited to attend special tutoring sessions where the professor not only reviewed lecture material but also discussed how to take notes and how to study for a statistics test. On the second test, the professor found that the students who received the tutoring improved considerably. The professor concluded that the tutoring sessions were effective in improving the test performance of those students. c. A researcher divided people attending a weight control clinic into two groups. Both groups were given the same diet to follow, but the experimental group was also asked to keep a record of everything they ate, to weigh all the food in grams, and to count the calories. At the end of the study, the researcher found that the experimental group had lost more weight. The researcher concluded that the experimental treatment was more effective than diet alone.
When children have disabilities or delays, they
a. Need a separate curriculum. b. Can usually participate in developmentally appropriate activities when relevant strategies are used. c. Can usually participate in developmentally appropriate activities without extra support. d. None of the above.
The quality of interactions and resulting relationships between a child and a primary caregiver is referred to as the:
a. secure relationship. b. base of exploration. c. attachment relationship. d. social relationship.
How is a null hypothesis denoted?
A. H0 B. H1 C. H2 D. H3