KING ABDULAZIZ UNIVERSITY Faculty of Sciences
Statistics Department First Exam STAT 110
Second Term
1430-1431 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. What type of sampling is being used if nursing supervisors are selected using random numbers in order to determine annual salaries?
A) Systematic sampling. C) Cluster sampling.
B) Random sampling. D) Stratified sampling.
2. If the mean of a set of data is 16 and a value X=22 has a z-score of 0.75, then the variance must be ...
A) 64 B) 8 C) 6 D) 36
3. Weights of air conditioners is an example of what level of measurement?
A) Ratio. B) Nominal. C) Ordinal. D) Interval.
Use the following to answer questions 4-6:
The ages of a department instructors are shown in the following stem and leaf plot:
3 | 0
4 | 1 1 1 3 3 5 | 0 3
6 | 0
4. The raw data set for the above stem and leaf plot is called ...
A) no mode B) unimodal. C) multimodal. D) bimodal.
5. The value of the median for the raw data for the above stem and leaf plot is ...
A) 1 B) 3 C) 41 D) 43
6. The midrange of the raw data for the above stem and leaf plot is ...
A) 46 B) 9 C) 45 D) 59 7. A dependent variable can also be called a(n) ...
A) free variable. B) outcome variable. C) explanatory variable. D) suggestive variable.
8. A truck is tested and the report stated that it may be worse than it's predecessor. This is NOT an example of ...
A) implied connections. B) detached statistics. C) changing the subject. D) suspect samples.
9. The class width for the class limit 5 - 8.1 is ...
A) 3.2 B) 4.1 C) 3 D) 3.1
10. Weights of fish caught in the red sea is an example of a(n) ... variable.
A) continuous B) nominal C) ordinal D) discrete
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11. In a left skewed distribution, we have the following relationship between the measures of central tendency:
A) mean > median > mode C) mode < median < mean
B) mode > median > mean D) mean = median = mode
12. A researcher needs to conduct a(n) .... study to test the effect of a new type of drug.
A) experimental B) observational C) independent D) manipulative Use the following to answer questions 13-15:
Use the following Boxplot to answer the following three questions:
0 5 10 15 20 25 30
13. The value of the IQR is ...
A) 10 B) 5 C) 20 D) 30 14. The shape of the distribution is ...
A) right skewed. B) bimodal. C) symmetric. D) left skewed.
15. The range of the raw data for the above Boxplot is ...
A) 20 B) 25 C) 5 D) 30 Use the following to answer questions 16-18:
The following data set displays the number of children for 7 families:
3, 5, 4, 6, 2, 43, 0
16. The most appropriate measure of average for the above data is the ...
A) mean B) median C) mode D) midrange 17. The mean value for the number of children is ...
A) 10 B) 9 C) 35 D) 70
18. The value of the standard deviation for the number of children ...
A) 298.67 B) 17.28 C) 15.12 D) 228.67
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Use the following to answer questions 19-24:
The following table represents the degree for a sample of employees in a company:
Classes Frequency Elementary
school 22
Secondary school 14
High school 16
Bachelor 26
PhD 10
19. The most appropriate measure of central tendency for this data is the ...
A) mean B) range C) mode D) midrange
20. The percentage of employees who holds high school degree is ...
A) 19.23% B) 83.33% C) 18.18% D) 30%
21. The type of data is ...
A) continuous. B) ordinal. C) nominal. D) discrete.
22. If a pie graph is used to represent the data, the degree for the employees who hold a bachelor would be ...
A) 106.36 B) 0.55 C) 0.15 D) 55.38 23. The sample size is ...
A) 60 B) 88 C) 5 D) 78
24. The cumulative frequency for the third class is ...
A) 48 B) 43 C) 13 D) 52
25. The class midpoint for the class limit 5 - 8.1 is ...
A) 6.55 B) 13.1 C) 5 D) 8.1
26. The most appropriate graph for discrete data is ...
A) pie graph. B) bar chart. C) histogram. D) time series graph.
27. In a study it has been reported that a diet high in fruits and vegetables will lower blood pressure. The independent variable is ...
A) diet. B) fruits. C) vegetables. D) blood pressure.
28. Which branch of statistics would experts employ to say that mortgage rates may soon hit bottom?
A) predictive statistics B) descriptive statistics C) inferential statistics D) differential statistics 29. When a study is conducted on all students of KAU, every measurement calculated for this study would be
called a ...
A) parameter. B) statistic. C) sample. D) population.
30. The lower class boundary for the class limit 5 - 8.1 is ...
A) 4.5 B) 5.05 C) 4.95 D) 5.5
Good luck Stat 110 Team
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Answer Key 1. B 2. A 3. A 4. B 5. D 6. C 7. B 8. C 9. A 10. A 11. B 12. A 13. B 14. D 15. A 16. B 17. B 18. C 19. C 20. C 21. B 22. A 23. B 24. D 25. A 26. B 27. A 28. C 29. A 30. C
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