Assignment Problems

Section 1.1

1. True or false? A population is a subset of a sample.
2. Determine if the data set is a population or a sample. The income of every employee at an amusement park.
3. Identify the population and the sample. A survey of 2500 motorcycle enthusiasts in Germany found that 25% preferred driving without a helmet.
4. Determine if the numerical value is a parameter or a statistic. In a survey of some college
   students, 25% said that they had difficulty balancing their checking account.
   Section 1.2
5. True or false? Data at the interval level can be ordered.
6. Determine if the data are qualitative or quantitative. The average monthly rainfall measured in centimeters for Argentina.
7. Determine if the data are qualitative or quantitative and identify the data set’s level of measurement. The average monthly temperatures measured in degrees Celsius for the dark side of the moon.
8. Determine if the data are qualitative or quantitative and identify the data set’s level of measurement. A list songs written by the Beatles.
9. Identify the level of measurement. The height of students in a class.
10. Identify the level of measurement. The colors available for a particular car model made in
    2011.
11. Identify the level of measurement. The top five songs for 2003.
12. Identify the level of measurement. A list of social security numbers.
    Section 1.3
13. What four different methods are frequently used to collect data?
14. True or false? Randomization is used to increase bias in a study.
15. What are three key elements of a well-designed experiment?
16. What problem can be introduced if confounding variables are present in a study?
17. Why is the validity of an experiment important?
18. What is the purpose for using blinding in a study?
19. You are asked to select a random sample of 10 students from the class. What must be done before anything else to start the process?
20. Identify the sampling technique. As part of a quality assurance program, every seventh car produced on an assembly line is subjected to additional evaluation.
21. Understanding the reasons. Why is simulation sometimes necessary when collecting data?
    Section 2.1
    For problems 22-24, to obtain full credit, you must use the methods described in section 2.1 of the text for determining the class width, the upper and lower limits of the classes, etc. Note: Other authors may recommend different methods.
    Many students find that it is easier to draw histograms by hand and then use a scanner. If you do this, remember to use the guidelines for image files listed in the Formatting Assignments page under Course Documents. Remember, that adjacent vertical histogram bars must touch.
22. Construct a frequency distribution with 6 classes for the data set. The data represent the dollar amount spent for texts for a semester. In the table, include the midpoints, relative frequencies, and cumulative frequencies. Which class has the greatest frequency and which has the least frequency?
    293 170 298 308 370 382
    247 294 272 247 267 307
    353 322 321 411 184 309
    413 305 359 339 331 269
    339 227 384 336 347 240
23. Frequency Histogram Construct a frequency histogram for the frequency distribution you did in problem 22.
24. Relative Frequency Histogram Construct a relative frequency histogram for the frequency distribution you did in problem 22.
25. For a data set if \({{x}_{\max }}\) is the largest datum value, \({{x}_{\min }}\) is the least datum value, and there are to be n classes, then for part of the class width calculation you must find

What must be done if the result of this calculation is a whole number with no decimal part?

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Solution: The downloadable solution consists of 7 pages, 1030 words and 2 charts.
Deliverable: Word Document