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Chapter 1 - Problems to look at Name___________________________________ SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Determine whether the numerical value is a parameter or a statistic. Explain your reasoning. 1) A recent survey by the alumni of a major university indicated that the average salary of 10,500 of its 175,000 graduates was $95,000. 1) Statistic because we are using a sample of 10,500 students from the 175,000 avaliable Identify the population and the sample. 2) A survey of 1378 American households found that 27% of the households own a computer. 2) Population: All American Households Sample: 1378 American Households MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Identify whether the statement describes inferential statistics or descriptive statistics. 3) The average age of the students in a statistics class is 19 years. A) descriptive statistics Answer: A 3) Answer: B 4) B) inferential statistics 4) There is a relationship between smoking cigarettes and getting emphysema. A) descriptive statistics B) inferential statistics SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 5) Explain the difference between a sample and a population. 5) A population is all objects or responces of interest. A sample is a subset of the population. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Determine whether the data are qualitative or quantitative. 6) the colors of automobiles on a used car lot Answer: A A) qualitative 6) B) quantitative 7) the number of seats in a movie theater Answer: A A) quantitative B) qualitative 1 7) Identify the data set's level of measurement. 8) hair color of women on a high school tennis team A) ratio Answer: D B) ordinal C) interval 9) temperatures of 12 selected refrigerators A) ratio D) nominal Answer: D B) ordinal 9) C) nominal 10) the data listed on the horizontal axis in the graph A) ratio 8) D) interval Answer: C B) interval C) nominal 10) D) ordinal SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 11) Explain the differences between the interval and ratio levels of measurement. 11) Interval level is numeric, can be ordered, differences in the data values are meaningful, and the value of zero represents a location on a scale and does not mean "none" Ratio level is similar to interval level except that the ratio of data values is meaningful, one data can be expresses as a multiple of another and the value of zero means "none" 12) Explain why data expressed with the Celsius temperature scale is at the interval level of measurement rather than the ratio level. 12) Celsius temperature is at the interval level because zero degrees celsius does not imply that there is no heat. It is a location on a scale MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Decide which method of data collection you would use to collect data for the study. Specify either observational study, experiment, simulation, or survey. 13) A study where a drug was given to 23 patients and a placebo to another group of 23 patients to determine if the drug has an effect on a patient's illness Answer: B A) observational study B) experiment C) survey D) simulation 2 13) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 14) Explain what bias there is in a study done entirely online. 14) Not everyone has access to a computer or uses the internet MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Identify the sampling technique used. 15) Thirty-five sophomores, 50 juniors and 37 seniors are randomly selected from 538 sophomores, 448 juniors and 394 seniors at a certain high school. Answer: A 15) A) stratified B) convenience C) cluster D) systematic E) random 16) A community college student interviews everyone in a statistics class to determine the percentage of students that own a car. Answer: E A) random B) cluster C) stratified D) systematic E) convenience SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 17) Explain the differences between cluster sampling and stratified sampling. Cluster Sample • Divide the population into groups (clusters) and select all of the members in one or more, but not all, of the clusters. Stratified Sample • Divide a population into groups (strata) and select a random sample from each group. 3 17) 16)