Define skew and kurtosis.
What will be an ideal response?
Ans: A skewed distribution is an asymmetrical distribution, with one tail longer than the other. When the longer tail is on the right of the peak it is said to be right skewed, or positively skewed. When the longer tail is on the left of the peak it is said to be left skewed, or negatively skewed. The kurtosis of a distribution refers to how sharp or flat its peak is. Normal distributions are said to have normal kurtosis, or to be mesokurtic. Distributions with sharp peaks are said to be leptokurtic, while those with flat peaks are said to be platykurtic.
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In an ABA design, the null hypothesis states that _____
a. there is no difference between the mean performance during A and B b. there is an increase in performance from A to B and then a decrease from B back to A c. performance during B is lower than performance during A d. there is no difference between the groups that get A and the groups that get B
A researcher observes the same participants in each of four groups: ABCD. Which of the following is a representative set of four order sequences? Hint: The correct sequence was computed using a Latin square procedure.
A. ABDC, BCAD, CDBA, DACB B. ABCD, DACB, BDCA, ABDC C. AABB, BBCC, CCDD, DDAA D. DCBA, ABCD, DCAB, BADC
Which of the following statements describes a risk factor for physical abuse?
a) Young children are more at risk for physical abuse if they are temperamentally difficult. b) Young children are more at risk for physical abuse if they are from a two-parent household. c) Young children are more at risk for physical abuse if they are from middle-class families. d) Young children are more at risk for physical abuse from their biological father rather than a stepfather.
Secondary sex characteristics begin to appear in girls at about:
a. 10 years c. 11 years b. 10.5 years d. 11.5 years