Statistics > QUESTIONS & ANSWERS > STATISTICS FINAL EXAM QUESTIONS WITH COMPLETE SOLUTIONS (All)

STATISTICS FINAL EXAM QUESTIONS WITH COMPLETE SOLUTIONS

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What is the difference between a parameter and a statistic? Correct Answer 1.1.3 Numbers are often assigned to data that are categorical in nature. (a) Consider these number assignments for catego... ry items describing electronic ways of expressing personal opinions: 1 Twitter; 2 e-mail; 3 text message; 4 Face book; 5 blog Are these numerical assignments at the ordinal data level or higher? Explain. (b) Consider these number assignments for category items describing usefulness of customer service: 1 not helpful; 2 somewhat helpful; 3 very helpful; 4 extremely helpful. Are these numerical assignments at the ordinal data level? Explain. What about at the interval level or higher? Explain. Correct Answer 1.1.5 A national survey asked 1261 U.S. adult fast-food customers which meal (breakfast, lunch, dinner, and snack) they ordered. (a) Identify the variable. (b) Is the variable quantitative or qualitative? (c) What is the implied population? Correct Answer 1.1.7 Categorize these measurements associated with student life according to level: nominal, ordinal, interval, or ratio. (a) Length of time to complete an exam (b) Time of first class (c) Major field of study (d) Course evaluation scale: poor, acceptable, good (e) Score on last exam (based on 100 possible points) (f) Age of student Correct Answer 1.1.11 You are interested in the weights of backpacks students carry to class and decide to conduct a study using the backpacks carried by 30 students. (a) Give some instructions for weighing the backpacks. Include unit of measure, accuracy of measure, and type of scale. (b) Do you think each student asked will allow you to weigh his or her backpack? (c) Do you think telling students ahead of time that you are going to weigh their backpacks will make a difference in the weights? Correct Answer 1.1.15 Explain the difference between a stratified sample and a cluster sample. Correct Answer 1.2.1 In a random sample of 50 students from a large university, all the students were between 18 and 20 years old. Can we conclude that the entire population of students at the university is between 18 and 20 years old? Explain. Correct Answer 1.2.5 [Show More]

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