# Assignment 1 Answer

BUQU 1230 Assignment #1 Solve the following 3 problems: 1- Consider the data set for the sample of 10 minisystems that is posted on the course web site. Open the Excel “Minisystems” file and answer the following questions: a. What are the elements in this study? How many elements are in the data set? Brand & Model b. How many variables are in the data set? 5 Variables (Price, Sound Quality, CD Capacity, FM Tuning, and Tape Decks) c. Which of the variables are quantitative and which are categorical? Categorical: Sound Quality, FM Tuning, and Tape Decks Quantitative: Price and CD Capacity . What is the average CD capacity for the sample? 3 e. What percentage of the minisystems provides an FM tuning rating of very good or excellent? 40% + 30% = 70% f. What percentage of the minisystems includes two tape decks? 40% g. Report the average price of minisystems for different classes of Sound Quality. |Fair |170 | |Good |314 | |Very Good |350 | 2- Suppose that there are 30 students in a classroom and that they have a grade point average listed in the following table.

Construct a frequency distribution table that summarizes the data into 6 classes. Calculate relative frequency and percent frequency for each class and use a graphing technique to chart your data. What type of chart would you use to present the frequency and percent frequency for this data? Student GPAs: 1. 23. 91. 9 3. 82. 42. 7 2. 32. 32. 6 0. 73. 13. 7 3. 62. 94. 0 2. 22. 71. 2 1. 90. 81. 8 2. 10. 32. 4 3. 13. 23. 2 0. 83. 13. 6 |GPA |Frequency |Relative |Percent | | | |Freq. |Freq. | |0-0. 69 |1 |0. 3 |3. 33 | |0. 7-1. 39 |5 |0. 17 |16. 67 | |1. 4-2. 09 |3 |0. 10 |10. 00 | |2. 1-2. 79 |9 |0. 30 |30. 00 | |2. 8-3. 49 |6 |0. 20 |20. 00 | |3. 5-4. 19 |6 |0. 20 |20. 00 | |Total |30 |1. 00 |100 | [pic] [pic] 3- The following data are the hours of personal computer usage during one week for a sample of 50 persons: 4. 11. 510. 45. 93. 45. 71. 66. 13. 03. 7 3. 14. 814. 82. 05. 4. 23. 94. 111. 13. 5 4. 14. 18. 85. 64. 33. 37. 110. 36. 27. 6 10. 82. 89. 512. 912. 10. 74. 09. 24. 45. 7 7. 26. 15. 75. 94. 73. 93. 73. 16. 13. 1 Summarize the data by constructing the following: a. A frequency distribution (use a class width of 3 hours) b. A relative frequency distribution c. A histogram d. An ogive e. Comment on what the data indicate about personal computer usage at home. The majority of people (about 75%) spend less than 7 hours per week using their computers and only 4 percent of people use their computers between 12. 7 and 15. 7 hours a week. Hours |Freq. |Relative | | | |Freq. | |0. 7-3. 69 |12 |0. 24 | |3. 7-6. 69 |25 |0. 5 | |6. 7-9. 69 |6 |0. 12 | |9. 7-12. 69 |5 |0. 1 | |12. 7-15. 69 |2 |0. 04 | |Grand Total |50 |1 | [pic] [pic]

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