1. REVIEW 6.6 - 6.8 You want to know if students would like year-round schools. You survey every fifth student entering first period classes. What is the population and sample method? 1. 2. A theater owner asks people in line to see a horror movie if they think the theater should show more comedies. Explain whether the survey method is likely to result in a biased survey. ANSWER People who go to horror movies may prefer horror to comedy, so the survey may be biased. ANSWER Population: all students at a school; systematic sample

2. Daily Homework Quiz The list shows the number of e-mails Brennan sent in 8 days. Find the mean, median, and mode(s) of the data. Which measure of central tendency best represents the data? 45, 25, 38, 42, 51, 52, 24, 51 3. ANSWER Mean: 41, Median: 43.5, Mode: 51 ; the median best represents the data since the mean is toward the lower end of the data and the mode is toward the upper end. 4. Find the range and mean absolute deviation of the data. Round to the nearest hundredth, if necessary. 38, 43, 56, 84, 98, 99, 102, 103 ANSWER Range: 65, mean absolute deviation: 24.16

3. Daily Homework Quiz Find the upper quartile, lower quartile, and interquartile range of the data below. 2, 5, 7, 10, 11, 15, 25, 33 5. ANSWER UQ: 20 LQ: 6 Interquartile Range: 14