psyc 2101 Exam 3 #Questions with correct answers
If there are relatively few frequencies at the left end of the abscissa on a
frequency polygon when compared to the right end, the curve is: - ✔✔negatively
skewed
A bar graph is appropriate for presenting the frequency distribution of a discrete
variable. - ✔✔True
A "Gee Whiz" graph makes the values plotted appear to be more variable than
they really are. - ✔✔True
The median of [5 4 4 4 3 3 2 2 1] is 3. - ✔✔True
The mean is the value that when subtracted from each score in a distribution
produces a sum of deviations equal to zero. - ✔✔True
Violating the 3/4 rule by making the width of the plot much greater than the
height of the plot makes the values plotted appear to differ from each other by
more than they really do. - ✔✔False
The mean is the value which: - ✔✔minimizes the sum of squared deviations about
it
In a distribution of 11 scores your score is a 79. There are 5 scores higher than
your score and 5 scores lower than your score. Your score, the 79, is the ______
of the distribution. - ✔✔median
, The mode of [5 4 4 4 3 3 2 2 1] is 3. - ✔✔False
For this distribution of scores: 1, 2, 3, 4, 40, the mean is 10 and the median is 3.
Which term best describes the shape of this distribution: - ✔✔positively skewed
You obtain the following scores: 10, 8, 6, 4, 2. The sample variance for this set of
five scores is 10. - ✔✔True
You have 11 scores. You compute their mean. You subtract that mean from each
of the 11 scores, obtaining 11 deviations. You square each of those 11 deviations,
obtained 11 squared deviations. You sum those 11 squared deviations, obtaining
a sum of 250. What is the sample standard deviation of this sample of 11 scores? -
✔✔5.00
The interquartile range is the difference between the third quartile and the first
quartile. - ✔✔True
The H-spread in a box and whiskers plot is equal to the difference between the
highest score and the lowest score. - ✔✔False
To calculate the range of a sample of scores, one subtracts the lowest score value
from the highest score value. - ✔✔True
(Q3-Q1)/2 is - ✔✔the semi-interquartile range
If the variance of a distribution is 9 then the standard deviation is 81. - ✔✔False
If there are relatively few frequencies at the left end of the abscissa on a
frequency polygon when compared to the right end, the curve is: - ✔✔negatively
skewed
A bar graph is appropriate for presenting the frequency distribution of a discrete
variable. - ✔✔True
A "Gee Whiz" graph makes the values plotted appear to be more variable than
they really are. - ✔✔True
The median of [5 4 4 4 3 3 2 2 1] is 3. - ✔✔True
The mean is the value that when subtracted from each score in a distribution
produces a sum of deviations equal to zero. - ✔✔True
Violating the 3/4 rule by making the width of the plot much greater than the
height of the plot makes the values plotted appear to differ from each other by
more than they really do. - ✔✔False
The mean is the value which: - ✔✔minimizes the sum of squared deviations about
it
In a distribution of 11 scores your score is a 79. There are 5 scores higher than
your score and 5 scores lower than your score. Your score, the 79, is the ______
of the distribution. - ✔✔median
, The mode of [5 4 4 4 3 3 2 2 1] is 3. - ✔✔False
For this distribution of scores: 1, 2, 3, 4, 40, the mean is 10 and the median is 3.
Which term best describes the shape of this distribution: - ✔✔positively skewed
You obtain the following scores: 10, 8, 6, 4, 2. The sample variance for this set of
five scores is 10. - ✔✔True
You have 11 scores. You compute their mean. You subtract that mean from each
of the 11 scores, obtaining 11 deviations. You square each of those 11 deviations,
obtained 11 squared deviations. You sum those 11 squared deviations, obtaining
a sum of 250. What is the sample standard deviation of this sample of 11 scores? -
✔✔5.00
The interquartile range is the difference between the third quartile and the first
quartile. - ✔✔True
The H-spread in a box and whiskers plot is equal to the difference between the
highest score and the lowest score. - ✔✔False
To calculate the range of a sample of scores, one subtracts the lowest score value
from the highest score value. - ✔✔True
(Q3-Q1)/2 is - ✔✔the semi-interquartile range
If the variance of a distribution is 9 then the standard deviation is 81. - ✔✔False
