Question number 1.
Your answer was D. Correct. The values for Q1 and Q3 for the data set below are Q1=116 and Q3=151. Are there any outliers for this data? If so, what are they?
A
The outliers are: B
There are no outliers.
C
The outliers are: D
The outliers are: E
The outliers are: Question number 2.
Your answer was C. Correct. What can be said about the relationship between the mean and the median for the data represented in the histogram below?
A
The median is less than the mean.
B
The mean and the median are approximately equal.
C
The mean is less than the median.
Question number 3.
Your answer was B. Correct. True or False:
A sample is the set of all possible data values for a given subject under consideration.
A
True
B
False
Question number 4.
Your answer was B. Correct. True or False:
The standard deviation is the square root of the variance.
A
False
B
True
Question number 5.
Your answer was B. Correct. Which of the following is a measure of variation?
A
mean
B
standard deviation
C
mode
D
median
Question number 6.
Your answer was B. Correct. Which of the following is an example of a data set with 5 values for which the standard deviation is zero.
A
-5,-4,0,3,5
B
2,2,2,2,2
C
-1,-1,0,1,1
D
1,2,3,4,5
Question number 7.
Your answer was C. Correct. If the test scores of a class of 36 students have a mean of 75.2 and the test scores of another class of 28 students have a mean of 67.4, then the mean of the combined group is
A
71.300
B
69.288
C
71.788
D
69.800
Question number 8.
Your answer was C. Correct. Given the first type of plot indicated in each pair, which of the second plots could not always be generated from it?
A
dot plot, histogram
B
dot plot, box plot
C
box plot, histogram
D
stem and leaf, dot plot
Question number 9.
Your answer was A. Correct. Calculate the mean, median, mode, range and standard deviation of the data: -96, -20, -20, 28, 99
A
mean = −
1.8, median = -20, mode = -20, range = 195, standard deviation = 71.7
B
mean = −
1.8, median = 28, mode = -96, range = 196, standard deviation = 71.7
C
mean = 7.8, median = -20, mode = -20, range = 195, standard deviation = 71.9
D
mean = 7.8, median = -96, mode = -20, range = 194, standard deviation = 71.9
E
None of the above
Question number 10.
Your answer was C. Correct. The figure below shows a cumulative relative frequency plot of 40 scores on a test given in a Statistics class. Which of the following conclusions can be made from the graph?
A
The horizontal nature of the graph for test scores of 60 and below indicates that those scores occurred most frequently.
B
The median test score is less than 75.
C
Sixty percent of the students had a test score above 80.
D
The IQR of the data is approximately 25.
Question number 11.
Your answer was C. Correct. The weights of male and female students in a class are summarized in the following boxplots:
Which of the following is NOT correct?
A
About 25%% of the female students have weights more than 128 lbs.
B
About 50%% of the male students have weights between 150 and 185 lbs.
C
The female students have more variability than the male students.
D
The median weight of the male students is about 166 lbs.
Question number 12.
Your answer was A. Correct. Given a data set consisting of 33 unique whole number observations, its five-number summary is:
How many observations are strictly less than 28?
A
8
B
7
C
9
D
27
[108, 111, 114, 116, 117, 121, 121, 125, 131, 141, 147, 152, 164, 221, 235]
[108, 111, 114, 221, 235]
235
[221, 235]
108
[15, 28, 42, 55, 71]
