Which of the following summaries are changed by adding a constant to each data value?I. the meanII. the medianIII. the standard deviation
A) I and II B) III only C) I and III D) I only E) I, II, and III
Q. 2The five-number summary of credit hours for 24 students in a statistics class is:
Min Q1 Median Q3 Max
13.0 15.0 16.5 18.0 22.0
Which statement is true?
A) There are both low and high outliers in the data.
B) There are no outliers in the data.
C) There is at least one high outlier in the data.
D) There is at least one low outlier in the data.
E) none of these
Q. 3The advantage of making a stem-and-leaf display instead of a dotplot is that a stem-and-leaf display
A) none of these
B) preserves the individual data values.
C) satisfies the area principle.
D) shows the shape of the distribution better than a dotplot.
E) A stem-and-leaf display is for quantitative data, while a dotplot shows categorical data.
Q. 4Suppose that a Normal model described student scores in a history class. Parker has a standardized score (z-score) of +2.5. This means that Parker
A) has a standard deviation of 2.5.
B) has a score that is 2.5 times the average for the class.
C) none of these
D) is 2.5 standard deviations above average for the class.
E) is 2.5 points above average for the class.
Q. 5Your Stats teacher tells you your test score was the 3rd quartile for the class. Which is true?
I. You got 75 on the test.II. You can't really tell what this means without knowing the standard deviation.
III. You can't really tell what this means unless the class distribution is nearly Normal.
A) II only B) I only C) III only D) none E) II and III
Q. 6Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90. Overall, what was the approximate mean score for all of the students on the quiz?
A) 85.7
B) none of these
C) It cannot be determined.
D) 84.3
E) 85.0
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