Exam1_Review

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Feb 20, 2024

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Stat 7 Exam 1 Review Name_____________________________________________ Match the letter of the word in the box to its definition. 1. _____Level of measurement with a constant size between the values. 2. _____Level of measurement that presumes one classification is ranked higher than the other. 3. _____Level of measurement where categories have no particular order. 4. _____Level of measurement in which the zero point is significant. Match the letter of the word in the box to its definition. 5. _____A grouping of quantitative data into mutually exclusive classes showing the number of observations in each class. 6. _____Methods of organizing, summarizing, and presenting data in an organized way. 7. _____The methods used to estimate a value of a population on the basis of a sample. 8. _____A grouping of qualitative data into mutually exclusive classes showing the number of observations in each class. A. Nominal B. Ordinal C. Interval D. Ratio A. Descriptive Statistics B. Inferential statistics C. Frequency distribution D. Frequency table
Stat 7 Exam 1 Review 9. The science of collecting, organizing, presenting, analyzing, and interpreting data to assist in making more effective decisions is referred to as _____________________. A. Financial analysis B. Sampling C. Statistics D. Error ratio E. None of the above 10. The entire set of individuals or objects of interest or the measurements obtained from all individuals or objects of interest is known as a _______________________________. A. Sample B. Population C. Data set D. Nominal E. None of the above 11. A portion, or part, of the group of interest is referred to as a______________________. A. Sample B. Analysis C. Population D. Data set E. None of the above 12. A graph in which the classes for qualitative data are reported on the horizontal axis and the class frequencies on the vertical axis is called a ___________________________. A. Pie chart B. Bar Chart C. Fixed data chart D. Scatter plot E. None of the above
Stat 7 Exam 1 Review 13. A set of data include 30 observations. How many classes would you suggest to construct a frequency distribution? 14. The following is the number of minutes to commute from home to work for a group of auto executives. Determine the class interval. Merrill Lynch recently completed a study regarding the size of online investment portfolios for a sample of clients in the 40- to 50-year-old age range. Listed is the value of all the investments in thousands of dollars for the 70 participants in the study. 15. How many classes would be included in a histogram for this data? 16. What class interval would be most appropriate? 28 25 48 37 41 19 32 26 18 23 23 29 36 31 26 21 32 25 31 43 35 42 38 33 28
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Stat 7 Exam 1 Review Use the data in the box, which shows the weekly amounts spent on groceries for a sample of households, to answer questions 17, 18, 19, 20, and 21. 17. How many classes would you recommend? 18. What class interval would you suggest? 19. What would you recommend as a lower limit of the first class? 20. How many households in this sample can be grouped into the third class? 21. What is the relative frequency of the third class? 22. What is the average of this data? 23. What is the median of this data? 24. What is the mode of this data? 25. What is the mean deviation of this data? 26. What is the standard deviation of this data? Remember, this is sample data. 27. What is the first quartile of this data? 271 363 159 76 227 337 295 319 250 192 181 321 309 246 278 50 41 335 429 294 570 342 279 235 434 123 325 154 225 97 478 226 89 221 324 441
Stat 7 Exam 1 Review 28. What is the third quartile of this data? 29. What is the 54 th percentile of this data? 30. There are two coffee shops. One is named Emu Café and the other is named Kanga Coffee. The average daily sales for Emu Café are $2,367 with a standard deviation of $84.50. The average daily sales of Kanga Coffee are $2,675 with a standard deviation of $104.25. Which coffee shop has the more reliable average for daily sales? Use the following histogram of sales data from the Applewood Auto Group to answer questions 31, 32, 33, and 34. 31. How many classes are there? 32. What is the class interval? 33. What is the midpoint of the last class? 34. What percentage of vehicles yielded a profit of between $1400 and $1800 for the Applewood Auto Group?
Stat 7 Exam 1 Review 35. The average weight of an American housecat is 10 pounds, with a standard deviation of 1.5 pounds. What percentage of housecats weigh between 8.5 pounds and 11.5 pounds? 36. What percentage of housecats weigh between 10 pounds and 11.5 pounds? 37. What value is 2 standard deviations below the mean of 10 pounds? 38. What percentage of housecats weigh between 7 pounds and 13 pounds? 39. What percentage of housecats weigh between 7 pounds and 10 pounds? 40. What is the value for 3 standard deviations above the mean?
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