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Statistics Ma3110

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Textbook Page 45 - #3, #5, #7

3. Identify the level of measurement (nominal, ordinal, interval, or ratio) used: a. The pulse rates of women listed in Data Set 1 of Appendix B Interval b. The genders of the subjects in Data Set 3 of Appendix B Nominal c. The body temperatures of subjects in Data Set 2 of Appendix B Interval d. A movie critic’s ratings of “must see, recommended…” etc. Ordinal
5. IBM Survey The computer giant IBM has 329,373 employees and 637,133 stockholders. A vice president plans to conduct a survey to study the number of shares held by individual stockholders. a. Are the numbers held by stockholders discrete or continuous? Discrete b. Identify the level of measurement for the numbers of shares held. Interval c. If the survey is conducted by telephoning 20 randomly selected stockholders in each of the 50 United States, what type of sampling is being used? Probability Sample (Different state populations, still 20 per state) d. If a sample of 1000 stockholders is obtained, and the mean number of shares is calculated for this sample, is this a statistic or a parameter? Statistic e. What is wrong with gauging stockholder views about employee benefits by mailing a questionnaire that IBM stockholders could complete and mail back? Voluntary Response has an additional stipulation of perhaps “Why” a stockholder was compelled to respond, welcoming possible consistent negative feedback. For example, only the unhappy were willing to respond.

7. Percentages a. Data Set 9 in Appendix B includes a sample of 35 movies, and 12 of them have ratings of R. What percentage of these 35 movies have an R rating? 34.3% of the 35 movies have an R rating. b. In a study of 4,544 students in grades 5 through 8, it was found that 18% had tried smoking. How many of the 4,544 have tried smoking? Approximately 818

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