“There is no difference in the weight between rats fed low-fiber diets and rats fed high-fiber diets.” This is an example of a(n) _______.
a. null hypothesis
b. alternative hypothesis
c. directional hypothesis
d. nondirectional hypothesis
Ans: a
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Children who have acquired disciplined work habits have a chance for greater school success
a. True b. False Indicate whether the statement is true or false
Which one of the following statements best describes a naturalistic study?
a. It takes place under well-controlled experimental conditions. b. It examines the behavior of people in their day-to-day environments. c. It examines and compares the behaviors of multiple groups of people. d. It focuses on newborn infants' behaviors, with the hopes that it can identify human beings' inborn tendencies.
With which of the following groups is norm-referenced grading systems more common?
a. kindergarten through second grade b. third through fifth grade c. college level d. middle school
In meta-analysis, the common measure for expressing results across studies is:
a. mean difference. b. extent of variance. c. effect size. d. median ratio.