Download PHC 121 Week 3 questions

‫‪PHC 121‬‬
‫‪Biostatistics‬‬
‫‪Week 3 questions‬‬
‫‪Week‬‬
‫‪3‬‬
‫‪For‬‬
‫‪Saudi electronic university‬‬
‫‪Dr. Ahmed Morshedy‬‬
‫للحصول على الشرح الكامل للمحاضرات يرجى التواصل على‪:‬‬
‫‪002 01015801806‬‬
‫غير مسموح بتداول هذه الملفات وال يجوز نشرها‪ ،‬وهذا ليس كتمانا ً للعلم‪ ،‬فهذا مجهود تنظيمي للمادة‬
‫العلمية المتوفرة للجميع وله بدائل‪ .‬وحقوق الملكية الفكرية عليها مئات األدلة منها‪ :‬حديث الرسول ﷺ‬
‫(من سبق إلى ما لم يسبق إليه مسلم فهو له)‪ ،‬وقرار مجمع الفقه اإلسالمي الدولي ما يلى (االسم التجاري‬
‫والعالمة التجارية و التأليف واالختراع واالبتكار هي حقوق خاصة ألصحابها‪ ،‬أصبح لها في العرف‬
‫المعاصر قيمة مالية معتبرة لتمول الناس لها‪ .‬وهذه الحقوق يعتد بها شرعاً‪ ،‬فال يجوز االعتداء عليها)‪.‬‬
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• What are the different types of statistical techniques ?
• What is the purpose of descriptive statistics ? (Midterm Q)
• What is the purpose of inferential statistics ? (Midterm Q)
• Enumerate the measures of Central Tendency ?
• Enumerate the Measures of Variation or Dispersion ?
• Mention 4 methods for graphical representation of data.
• Define:
- Mean
- Median
- Mode
- Range
- Interquartile range (IQR)
• Why the mean can be misleading in some case?
• Why the mean is very much affected by extreme value?
Because it used the actual values of all the score in the data set.
‫أهم المسائل فى الشابتر وأكثرها تكرارا ً باالختبارات هى المسائل على ال‬
Mean – median – mode – range
Histogram – Box-Plots -: ً ‫الرسوم البيانية األكثر تكرارا‬
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Week 3 ‫أسئلة كتاب المادة على‬
1. Why are descriptive statistics so important?
a) They allow us to get to know our data
b) They allow us to assess our blind dates
c) They allow us to describe our data to others
d) Both a) and c) above
2. Which of the following is not a measure of central tendency?
a) Mean
b) Range
c) Mode
d) Median
3. If you wanted to plot the frequency of occurrence of the scores in your
sample which of the following would you use?
a) Box-plot
b) Line graph
c) Histogram
d) None of the above
4. In a box-plot the length of the box is equal to which of the following:
a) Variance
b) Range
c) Interquartile range
d) Standard deviation
5. What percentage of the scores in a sample fall between the first and third
quartiles?
a) 25%
b) 50%
c) 75%
d) 100%
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6. What are the mean, median and mode of this set of scores:
6, 5, 7, 9, 11, 15, 17, 5, 8
a) 6.5, 11, 17
b) 9.22, 8, 5
c) 7.45, 15, 11
d) None of the above
Questions 8 and 9 relate to the following box-plots:
7. Which condition has the greater variability in terms of number of fillings?
a) Brushing_Flossing
b) Flossing_only
c) The variability is roughly the same
d) We can’t tell anything about the variability of scores from this box-plot
8. Which set of scores has the highest median?
a) Brushing_Flossing
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b) Flossing_only
c) The medians are equal
d) We can’t tell about the medians from this box-plot
Questions 12, 13 and 14 refer to the following graph:
9. What is this form of graph called?
a) Histogram
b) Bar chart
c) Box-plot
d) None of the above
10. What is the bin width for this graph?
a) 1
b) 2
c) 5
d) 10
11. What are the least frequently occurring scores?
a) 5–10
b) 10–15
c) 20–25
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d) None of the above
12- Which method is used to calculate how closely the scores in a sample
cluster around the middle of that sample: (Final MCQ)
a) Range
b) Inter quartile range
c) Variation
d) mean
e) Variance
13- What is the measure of central tendency that is not influenced by extreme
values (Outliers) in a data set: (Final MCQ)
a) mean
b) mode
c) variance
d) median
MCQs answers
1d, 2b, 3c, 4c, 5b, 6b, 7b, 8b, 9a, 10c, 11d
Week 3 extra ‫ مشروحة فى محاضرة‬MCQ ‫إجابات أسئلة ال‬
34:35 ‫ بدءا ً من التوقيت‬notes
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‫أسئلة ‪ Week 3‬من الكويزات األسبوعية للعام الماضي‬
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‫أسئلة ‪ Week 3‬من اختبارات العام الماضي‬
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