KING ABDULAZIZ UNIVERSITY Faculty of Sciences
Statistics Department First Exam STAT 110
Second Term
1430-1431 30
A
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 every seventh customer entering a shopping mall is asked to select her of his favorite store?
A) Systematic sampling. C) Cluster sampling.
B) Stratified sampling. D) Random sampling.
2. In a study it has been reported that a diet high in fruits and vegetables will lower blood pressure. The dependent variable is ...
A) blood pressure. B) fruits. C) vegetables. D) diet.
3. The class width for the class limit 5.1 - 8 is ...
A) 3.1 B) 3 C) 6.55 D) 2.9
4. If the mean of a set of data is 19 and a value X=23.5 has a z-score of 0.75, then the variance must be ...
A) 11.39 B) 6 C) 3.38 D) 36
5. The upper class boundary for the class limit 5.1 - 8 is ...
A) 7.95 B) 8.5 C) 8.05 D) 7.5
6. In a right skewed distribution, we have the following relationship between the measures of central tendency:
A) mean < median < mode C) mode > median > mean
B) mean = median = mode D) mean > median > mode
7. If a researcher would like to determine the effect of three methods of teaching, then he needs to conduct a(n) ...
A) experimental study. B) manipulative study. C) independent study. D) observational study.
Use the following to answer questions 8-10:
The following data set displays the number of children for 7 families:
3, 5, 4, 6, 2, 49, 1 8. The mean value for the number of children is ...
A) 35 B) 70 C) 7 D) 10
9. The value of the standard deviation for the number of children ...
A) B) 298.67 C) 17.28 D)
10. The most appropriate measure of average for the above data is the ...
A) mode B) mean C) midrange D) median
Page 1
11. When a study is conducted on a group of students from KAU, every measurement calculated for this study would be called a ...
A) statistic. B) sample. C) population. D) parameter.
Use the following to answer questions 12-14:
Use the following Boxplot to answer the following three questions:
0 5 10 15 20 25 30 35 40
12. The value of the IQR is ...
A) 35 B) 25 C) 40 D) 10
13. The range of the raw data for the above Boxplot is ...
A) 25 B) 40 C) 10 D) 35 14. The shape of the distribution is ...
A) bimodal. B) symmetric. C) left skewed. D) right skewed.
Use the following to answer questions 15-17:
The ages of a department instructors are shown in the following stem and leaf plot:
3 | 1
4 | 2 2 2 6 8 5 | 0 7
6 | 1
15. The value of the median for the raw data for the above stem and leaf plot is ...
A) 42 B) 46 C) 2 D) 6
16. The raw data set for the above stem and leaf plot is called ...
A) multimodal. B) unimodal. C) trimodal. D) bimodal.
17. The midrange of the raw data for the above stem and leaf plot is ...
A) 6 B) 59 C) 9 D) 46
18. A magazine tests a new car and reports that it could be twice as fun to drive as it's predecessor. This is NOT an example of ...
A) implied connections. B) suspect samples. C) changing the subject. D) detached statistics.
19. Which branch of statistics would employ probability to predict how many miles one would be able to drive a 2000 Toyota Celica during its lifetime?
A) inferential statistics B) differential statistics C) descriptive statistics D) predictive statistics 20. An independent variable can also be called a(n) ...
A) suggestive variable. B) outcome variable. C) explanatory variable. D) free variable.
Page 2
21. Ranking of tennis players is an example of what level of measurement?
A) Ratio. B) Ordinal. C) Nominal. D) Interval.
Use the following to answer questions 22-27:
The following table represents the favorite car make for a group of students Classes Frequency
Toyota 20
Nissan 15
Chevrolet 13
GMC 12
Honda 18
22. The sample size is ...
A) 60 B) 18 C) 5 D) 78
23. If a pie graph is used to represent the data, the degree for the GMC brand would be ...
A) 0.15 B) 55.38 C) 0.55 D) 15.38
24. The most appropriate measure of central tendency for this data is the ...
A) range B) mean C) mode D) midrange 25. The percentage of students who like Nissan is ...
A) 30% B) 25% C) 19.23% D) 83.33%
26. The cumulative frequency for the third class is ...
A) 13 B) 48 C) 35 D) 43 27. The type of data is ...
A) discrete. B) continuous. C) ordinal. D) nominal.
28. The most appropriate graph for continuous data is ...
A) pie graph. B) time series graph. C) histogram. D) bar chart.
29. The class midpoint for the class limit 5.1 - 8 is ...
A) 13.1 B) 8.1 C) 6.55 D) 5.1
30. The number of birds in a tree is an example of a(n) ... variable.
A) discrete B) ordinal C) continuous D) nominal
Good luck Stat 110 Team
Page 3
Answer Key 1. A 2. A 3. B 4. D 5. C 6. D 7. A 8. D 9. C 10. D 11. A 12. D 13. A 14. C 15. B 16. B 17. D 18. C 19. A 20. C 21. B 22. D 23. B 24. C 25. C 26. B 27. D 28. C 29. C 30. A
Page 4
