1- Number of bicycles sold in one year by a large sporting goods store is an example of what type of data? A) Qualitative B) Quantitative

Transcription

1 Chapter 1 Exercises 1- Number of bicycles sold in one year by a large sporting goods store is an example of what type of data? 2- Colors of baseball caps in a store is an example of what type of data? 3- Time to cut a lawn is an example of what type of data? 4- Classification of children in a day-care center (infant, toddler, preschool) is an example of what type of data? 5- Weights of fish caught in the red sea is an example of what type of data? 6- Marital status of faculty members in a large university is an example of what type of data? 7- Number of doughnuts sold each day by a doughnuts store is an example of what type of data? 8- Water temperatures of six swimming pools in Jeddah on a given day are an example of what type of data? 9- Weights of cats in a pet shelter is an example of what type of data? 10- Lifetime (in hours) of 12 flashlight batteries is an example of what type of data? 11- Number of cheeseburgers sold each day by a hamburger stand on a college campus is an example of what type of data? 12- Number of DVDs rented each day by a video store is an example of what type of data? 13- Capacity (in gallons) of six dams in Saudi Arabia is an example of what type of data?

2 14- Ages of people working in a large factory is an example of what type of data? 15- Number of cups of coffee served at a restaurant is an example of what type of data? 16- The time it takes a student to drive to school is an example of what type of data? 17- Nationality of people who are living in Saudi Arabia is an example of what type of data? 18- Rankings of tennis players is an example of what type of data? 19- Weights of air conditioners is an example of what type of data? 20- Temperatures inside 9 refrigerators is an example of what type of data? 21- Ratings of eight local plays (poor, fair, good, excellent) is an example of what type of data? 22- Time required for mechanics to do a tune-up is an example of what type of data? 23- Ages of students in a classroom is an example of what type of data? 24- Levels of services is an example of what type of data? 25- Number of bags is an example of what type of data? 26- Classification of automobiles as subcompact, compact, standard, and luxury is an example of what type of data? 27- The number of absences per year that a worker has is an example of what type of data? 28- Data that can be classified according to color are example of what type of data?

3 29- The time needed for a student to reach KAU from his home is 30- Students' registration numbers (Identification numbers) are example of 31- Temperature in Saudi Arabia is a (an) 32- Salaries of the staff in King Abdulaziz University are a (an) variable. 33- Lifetime of an electronic device is a (an) variable. 34- A researcher divided subjects into two groups according to gender and then selected members randomly from each group for his sample. What sampling method was the researcher using? A) Cluster B) Random C) Systematic D) Stratified 35- In a large school district, all teachers from two buildings are interviewed to determine whether they believe the students have less homework to do now than in previous years. 36- Every seventh customer entering a shopping mall is asked to select her or his favorite store. 37- Nursing supervisors are selected using random numbers in order to determine annual salaries. 38- Every 100th hamburger manufactured is checked to determine its fat content. 39- Mail carriers of a large city are divided into four groups according to gender (male or female) and according to whether they walk or ride on their routes. Then 10 are selected from each group and interviewed to determine whether they have been bitten by a dog in the last year. 40- An auto analyst is conducting a satisfaction survey, sampling from a list of 10,000 new car buyers. The list includes 2,500 Ford buyers, 2,500 GM buyers, 2,500 Honda buyers, and 2,500 Toyota buyers. The analyst selects a sample of 400 car buyers, by randomly sampling 100 buyers from each brand.

4 41- A high school counselor uses a computer to generate 50 random numbers and then picks students whose names correspond to the numbers. This is an example of.. sampling A) random B) cluster C) stratified D) systematic 42- Listing discharged hotel customers, numbering the customers and using random number table to obtain sample is an example of sampling A) random B) cluster C) stratified D) systematic Chapter 2 Exercises 1- Find the class boundaries, midpoints, and widths for each class. Class limit Class boundaries Midpoint Class width a b The number of students enrolled at a local college for each year during the last 5 years is example of which graph or chart? A) Bar Chart B) Time series graph C) Pie graph 3- Data such as blood types (A, B, AB, O) can be organized into a(n) frequency distribution. A) grouped frequency distribution B) frequency polygon C) ungrouped frequency distribution D) categorical frequency distribution 4- Data collected over a period of time can be graphed using a(n).. graph. A) histogram B) frequency polygon C) cumulative frequency graph D) time series graph Chapter 3 Exercises 1- For a recent year, the worth (in billions of dollars) of a sample of the 12 wealthiest people under the age of 65 is shown: 14, 12, 48, 20, 18, 18, 12.6, 10.4, 7.3, 5.3, 4.5,4 a- Find the mean. b- Find the mode. c- Find the median. 2- The worth of a sample of 12 of the wealthiest people age 65 and over is shown: 41.0, 13.7, 10.0, 18.0, 11.3, 7.6, 7, 18, 20, 60, 7, 8.5 a- Find the mean. b- Find the mode. c- Find the median.

5 3- Shown here are the numbers of stories in the 12 tallest buildings in St. Paul, Minnesota. 32, 36, 46, 20, 32, 18, 16, 34, 26, 27, 26, 41 and shown here are the numbers of stories in the12 tallest buildings in Chicago, Illinois. 100, 100, 83, 60, 64, 65, 66, 74, 60, 67, 57, 41 Which data set is more variable? 4- The average age of the accountants at Three Rivers Corp. is 25 years, with a standard deviation of 5 years; the average salary of the accountants is $31000 with a standard deviation of $4000. Compare the variations of age and income. 5- Which score indicates the highest relative position? a- A score of 3.2 on a test with mean 4.6 and standard deviation 1.5. b- A score of 55 on a test with mean 65 and standard deviation 10. c- A score of 630 on a test with mean 800 and standard deviation 200. d- A score of 43 on a test with mean 50 and standard deviation Check each data set for outliers. a- 16, 18, 22, 19, 3, 21, 17, 20 b- 321, 343, 350, 327, Identify the five-number summary and find the interquartile range for the following data values: 19, 16, 48, 22, 7 8- The following data represent the number of listeners (in thousands) of 15 radio stations in the 6:00 to 9:00 A.M. time slot in Pittsburgh. 229, 182, 129, 112, 122, 93, 97, 114, 95, 114, 60, 89,75, 70, 68 Find each of these. a- Mean b- Median c- Mode d- Range e- Variance f- Standard deviation 9- What is the value of the mode when all values in the data set are different? A) 0 B) 1 C) There is no mode. D) It cannot be determined. 10- When data are categorized as, for example, places of residence (rural, suburban, urban), the most appropriate measure of central tendency is the A) Mean B) Median C) Mode D) Range 11- Which is not part of the five-number summary? A) Q 1 and Q 3 B) The mean C) The median D) Min and Max

6 12- A statistic that tells the number of standard deviations a data value is above or below the mean is called A) a quartile B) a percentile C) a coefficient of variation D) a z score

7 Chapter 1 1 B 2 A 3 B 4 A 5 B 6 A 7 A 8 B 9 B 10 B 11 A 12 A 13 B 14 B 15 A 16 B 17 D 18 C 19 B 20 B 21 C 22 B 23 B 24 C 25 A 26 C 27 A 28 D 29 B 30 D 31 B 32 B 33 B 34 D 35 D 36 B 37 A

8 38 B 39 C 40 C 41 A 42 A Chapter 2 a , 12.5, 6 1 b , 62, 19 2 B 3 D 4 D Chapter 3 a b 18 c 12.3 a b 7, 18 c %, 24.76%, The building in St. Paul is more variable than the building in Chicago Illinois. 20%, 12.9%, age is more variable than salary. a b -1 c (highest relative position) d -1.4 a 3 b No outliers z 7 b 11.5 c 19 d 35 e 48 a b 97 c 114 d 169

9 e f C 10 C 11 B 12 D