KING ABDULAZIZ UNIVERSITY Faculty of Sciences
Statistics Department
First Exam STAT 110
Second Term
1431-1432 30
B
Name: ID #: Section:
You have 30 questions. You have 90 minutes to solve the exam. Please mark all your answers on the answer sheet provided to you. Make sure that the answer sheet form matches the question form. You have to submit both question paper and answer sheet but only the answer sheet will be graded. Good luck
Choose the best answer for each of the following questions:
1. Which of the following is an example of a continuous random variable?
A) The time it takes to download a program off the internet in different stations..
B) The number of students who pass STAT 110 each term.
C) The usual time for each lecture on Saturday, Monday and Wednesday.
D) The number of letters in the English alphabet.
2. ... deals more with creating models and theoretical data.
A) Sample B) Probability C) Population D) Statisitics
3. Extremely small or extremely large values are affecting the ... the most.
A) mode and the variance C) mean and the variance
B) mode and the median D) mean and the mode
4. What is the most appropriate measure of central tendency for the following data set?
Ahmad, Ali, Saeed, Ahmad, Saeed, Ali, Ahmad A) midrange B) mode C) median D) mean
5. ... is the measurement that is used to determine if the data values fall into the lower half of the distribution.
A) The mean B) The mode C) The median D) The midrange 6. Which of the following is an example of a nominal variable?
A) Your favorite city. C) The first digit of your phone number.
B) Your annual expenditure on car service. D) Your satisfaction rate as good, fair or poor.
7. ... is a goal of inferential statistics.
A) Displaying aspects of the collected data B) Reporting numerical findings
C) Estimating population characteristics or measurements D) Summarizing data
8. Three persons earn 6 SAR an hour, six earn 7 SAR an hour, and one earns 12 SAR an hour. The earning weighted mean per hour is …
A) 7.2 SAR. B) 6.3 SAR. C) 7.8 SAR. D) 6.9 SAR.
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Use the following to answer questions 9-11:
The sugar level in the blood can be controlled by the right medicine, diet and exercise program. In a random medical study for controlling the sugar level in the blood, the patients have been given medicine and exercise only. Answer the following three questions.
9. ... are independent variables.
A) Diet and exercise B) Medicine and exercise C) Sugar levels D) Medicine and diet 10. The confounding variable is ...
A) medicine. B) sugar level. C) diet. D) exercise.
11. The type of study is ...
A) simulation. B) experimental. C) theoretical. D) observational.
12. The stem part for the number 925 is … A) 9 B) 25 C) 5 D) 92
13. Find the percentage of a frequency for a section with 45 degree in a pie graph.
A) 20% B) 25% C) 10% D) 12.5%
14. The discrete data can be organized into a table that is called ...
A) categorical frequency distribution. C) nominal frequency distribution.
B) ungrouped frequency distribution. D) grouped frequency distribution.
15. A sample measurement such as the variance or the mode is called ...
A) inferential statistics. B) a parameter C) a statistic. D) hypothesis.
16. The number of travelled miles on eight cars are 19500, 17750, 20600, 18400, 17950, 10890, 10925 and 18010 miles. What are these ungrouped data called?
A) Raw data. B) Frequency distribution. C) Class limits. D) Class frequencies.
17. A ... retains the actual data while showing them in a graphic form.
A) grouped frequency distribution B) Pareto chart C) stem and leaf plot D) histogram Use the following to answer questions 18-20:
The number of absence days for 7 male-students are 3, 5, 2, 6, 4, 3, 5. Answer the following three questions.
18. The values of the central tendency measures are ...
A) mean = 4, range = 4. C) mean = 4, median = 4.
B) mean = 4, mode = 5. D) median = 4, mode = 3.
19. The values of the measures of variation are ...
A) variance = 2, range = 4. C) variance = 2, midrange = 4.
B) standard deviation = 1.414, midrange = 4. D) variance = 1.414, range = 4.
20. The value of the coefficient of variation is ...
A) 70.7% B) 28.3% C) 35.4% D) 47.1%
21. All subjects that are being studied is called ...
A) statistic. B) parameter. C) sample. D) population.
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22. Which of the following is a qualitative variable?
A) Miles driven. B) Car made. C) Grade points. D) Income.
23. The HR department is commissioning a survey on childcare and wants to sample 200 faculty members from 500 male and 1000 female faculty members. The type of sampling method that would best represent the possible differencing in the opinions of males and females is ...
A) cluster sample. B) systematic sample. C) stratified sample. D) simple random sample.
24. In a negatively skewed distribution, we have the following relationship between the measures of central tendency:
A) mode < median < mean C) mean = median = mode B) mean < median < mode D) mean > median > mode 25. To determine the spread of a data set you can use ...
A) the standard deviation or the midrange. C) the standard deviation or the range.
B) the variance or the mode. D) the mean or the variance.
Use the following to answer questions 26-30:
The number of patients in the waiting rooms within a hospital at a specific time are given by the following frequency distribution.
Number of Patients 2 3 4 5 6 Total
Frequency 4 5 9 ? 4 30
Answer the following five questions.
26. The missing frequency for the fourth class is ...
A) 9 B) 8 C) 10 D) 7 27. The sample size is ...
A) 32 B) 30 C) 20 D) 5
28. The data can be best represented graphically by ...
A) bar chart. B) time series graph. C) frequency polygon. D) histogram.
29. The lower class boundary for the second class is ...
A) 4.5 B) 3.5 C) 2.5 D) 5.5
30. The percentage of the number of waiting rooms that have 2 patients is ...
A) 12.50% B) 34.37% C) 36.67% D) 13.33%
Good luck Stat 110 Team
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Answer Key
1. A 2. B 3. C 4. B 5. C 6. A 7. C 8. A 9. B 10. C 11. B 12. D 13. D 14. B 15. C 16. A 17. C 18. C 19. A 20. C 21. D 22. B 23. C 24. B 25. C 26. B 27. B 28. A 29. C 30. D
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