According to Zigler et al. (2002) and Franklin and Mansuy (2011), which of the following is true about familial intellectual disability?
A. Usually, an apparent biological defect exists in familial intellectual disability.
B. Studies have confirmed that the family background of intellectual disability is caused by external factors such as stress and lack of work-life balance.
C. Typically, people with familial intellectual disability have Down syndrome.
D. Whether the family background of intellectual disability is caused by environmental factors or by some underlying genetic factor is usually impossible to determine.
Answer: D
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a. True b. False Indicate whether the statement is true or false
For a fixed level of significance, how is the critical value for chi-square related to degrees of freedom?
a. The critical value increases as df increases. b. The critical value decreases as df increases. c. The critical value increases as sample size increases. d. The critical value decreases as sample size increases.
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The fact that symptoms of Huntington's disease include the inability to control voluntary movements makes sense because the major damage from Huntington's seems to be in the
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