Practice Quiz for Week 3

# Practice Quiz for Week 3 - Math 221 Statistics Practice...

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Math 221 - Statistics Practice Quiz Week 2 This quiz review covers materials from Weeks 1 and 2. Your quiz will be in Week 3 located in the Quiz Tab. Your quiz will mostly comprise of multiple choice, true/false, and essay questions. The answers are at the end of the questions. 1. The measurement that describes the variation of a data set is called the_________. 2. When a scatter plot's (x,y) points are all pretty close to the "line of best fit", then how would you describe the relationship between the points? 3. True or False: Cause and effect relationships cannot be determined using the coefficient of determination. 4. True or False: Correlations are used to help identify the relationship between two variables. For example, the amount of rain in July (x) and the size of tomatoes in August (y) could be analyzed using correlation and regression techniques. 5. The scores of the top ten finishers in a recent LPGA Valley of the Stars Tournament are listed below. (Source: Los Angeles Times) 73 67 72 67 76 72 73 68 71 73 Find the mode score. 6. Multiple choice: The Median is a. the most stable measurement of Central Tendency. b. the least stable measurement of Central Tendency. c. only stable if the standard deviation is small. d. equal to the InterQuartile Range. 7. The correlation coefficient (r) can vary between the values of 8. The ______________________________ measures "how well" the line of best fit matches the scatter diagram relationship. 9. The average age of the students in a statistics class is 20 years. Does this statement describe descriptive statistics, census, simulation, or inferential statistics?

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10. Which regression equations show a negative correlation between x and y. 11. If we asked each person in the class to count the kinds of e-mail messages that they received this week (business, personal, advertising) and we recorded the results, would this data be classified as qualitative or quantitative data? 12. What method of data collection would you use to collect data for a study of the salaries of doctors at a particular hospital? Use a simulation, perform an experiment, use sampling, or take a census? 13. From a large survey of college freshmen, it is predicted that the average time spent studying per week is between 15 and 19 hours. This statement describes inferential or descriptive statistics? 14. To help measure customer satisfaction, every 25th customer that walks through the door of the grocery store is asked to fill-out a survey. What sampling technique is used? random, stratified, systematic, cluster, or convenience 15. Use this table to answer the questions. Height (in inches) | Frequency ____135-139_________|_____6_____ ____140-144_________|_____4_____ ____145-149_________|____11_____ ____150-154_________|____15_____ ____155-159_________|____ 8_____ Identify the class width. Identify the midpoint of the first class. Identify the class boundaries of the first class. Give the relative frequency for each class. 16. Suppose the variance = 289. Find the standard deviation.

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