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Chapter 2: Central Tendency And Variability
Test Description: Statistics for Psychology
Instructions: Answer all questions to get your test result.
1) The correct description of the mean is
A
the middle score if all the scores are ordered from lowest to highest.
B
the sum of the scores that is most frequent in a distribution.
C
the average of the squared deviations from the median.
D
the sum of the scores divided by the number of scores.
2) The ΣX for the scores 1, 1, 8, and 10 is
A
4
B
20
C
4.5
D
5
3) In statistical formulas, N stands for
A
the number of different values for a variable.
B
the normal curve.
C
the normalized Z score.
D
the number of scores.
4) The mean and the mode for a statistics test will be the same if the distribution is
A
skewed.
B
multimodal.
C
normal.
D
bimodal.
5) If a cognitive psychologist finds that a group of one-year-old children can name 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, and 35 things, the most useful measure of central tendency will be the
A
mean.
B
median.
C
range.
D
mode.
6) The median is greater than the mean in a distribution that is
A
normal.
B
skewed to the right.
C
symmetrical.
D
skewed to the left.
7) The variance is the same as the
A
average of the squared deviations.
B
sum of the squared deviations.
C
sum of the absolute deviations.
D
average of the absolute deviations.
8) If the variance is 9, then the standard deviation is
A
3
B
91
C
32
D
18
9) SS refers to
A
variance computed using the N−1 formula
B
Σ(X−M)²
C
SD²
D
standard deviation
10) A psychologist studying cultural diversity who conducts a few lengthy interviews with members of various cultural communities is using
A
behavioral techniques.
B
quantitative techniques.
C
positivistic techniques.
D
qualitative techniques.
*select an answer for all questions
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