Các lý thuyết đã trải qua thử nghiệm rộng rãi trong thời gian qua, qua không gian và được chấp nhận hầu như phổ quát là? a. Giả thuyết
b. Lý thuyết
c. Quy luật
d. 3 đáp án trên sai

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a.static group comparisonb. pretest-posttest control group designc.control-group-time-series designd. nonrandomized control-group pretest-posttest design

Linda, mike, and carol all call their group leader by her first name, juanita. a fifth group member, leslie, calls her ʺms. garcia.ʺ leslie has not accepted:

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