Exam (elaborations)
UNIT 2- MILESTONE 2 INTRO TO STATS
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UNIT 2- MILESTONE 2 INTRO TO STATS
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UNIT 2- MILESTONE 2 INTRO TOSTATS
The midterm exam scores obtained by boys and girls in a class are listed in
the table below
What does the circled section represent?
Twelve boys scored 8 marks on the exam.
Two boys scored between 80 and 89 marks on the exam.
Eight boys scored over 10 marks on the exam.
Eight boys scored 12 marks on the exam. - -If we recall that the stem and
leaf can give us the actual values in the data set, then the circle corresponds
to 81 and 82. We can then note that there are two scores from boys between
80 and 89.
-Sara wonders what percentage of her students answered at least half of the
quiz questions incorrectly.
The cumulative frequency of students who earned a score of 20 or lower on
the quiz is __________. - -To get cumulative frequency of 20 or less, we
simply add up any bin that has the number 20 or less, such as the bin that
shows scores of 1-5, 6-10, 11-15, and 16-20.
-In which of these cases should mode be used?
When the data has extreme values
When the data is represented using ratio scale
When the data is represented using interval scale
When the data is qualitative and we talk about the most frequent category -
-If the data is qualitative, it is only descriptive. In this case, the mode is a
good measure since the mode examines the most frequently occurring
value. The data can be non-numeric.
-The third quartile (Q3) value from this box plot is __________.
48
37
29
60 - -The value for Q3 is the right edge of the box, which in this figure is 48.
-When a survey was conducted among 100 students to find their favorite
pizza topping, 45 students voted for pepperoni, 25 for mushrooms, and 30
voted for cheese.
If a pie chart were made showing the number of votes for each topping, the
central angle for the cheese sector would be __________.
198°
90°
108°
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