. An environmental factor can only threaten the internal validity of a study when it ______ with the levels of an independent variable.

A. is held constant
B. is equal
C. varies systematically
D. is eliminated


Ans: C

Education

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Briefly explain how a child can obtain adequate dietary protein if they don't include any meat in their meals

What will be an ideal response?

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A teacher split a 50-item test into odd and even items, scored each half, and then correlated odd scores with even scores. The correlation coefficient was .55 . What is the estimated reliability for the full 50-item test?

a. .80 b. .71 c. .69 d. .65 e. .60

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Critics of the use of ability grouping in schools have charged that

A. it damages the self-esteem of the students in the lower tracks and they receive poorer quality teaching. B. it harms the high-ability students because too many resources are drawn off to support the low-ability students. C. this is really a way to make a teacher's job easier, not a way to help improve student performance. D. there is no place in this system for the student of average ability.

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Which of the following is NOT part of the Education Policy Planning and Research Community (EPPRC)?

a. the U.S. Department of Education (USDOE). b. universities. c. think tanks. d. state legislatures.

Education