Lesson Quizzes Preview 7-1 Mean, Median, Mode, and Range 7-2 Additional Data and Outliers 7-3 Choosing the Most Useful Measure 7-4 Analyzing Data Displays 7-5 Misleading Graphs 7-6 Populations and Samples 7-7 Selecting Samples 7-8 Identifying Sampling Errors and Bias

7-1 Mean, Median, Mode, and Range Lesson Quiz Use the following data set: 18, 20, 56, 47, 30, 18, 21. 1. Find the range. 2. Find the mean. 3. Find the median. 4. Find the mode. 5. Bonnie ran a mile in 8 minutes, 8 minutes, 7 minutes, 9 minutes, and 8 minutes. What was her mean time? 38 30 21 18 8 minutes

7-2 Additional Data and Outliers Lesson Quiz At the college bookstore, your brother buys 6 textbooks at the following prices: $21, $58, $68, $125, $36, and $140. 1. Find the mean. 2. Find the median. 3. Find the mode. 4. Your brother signs up for an additional class, and the textbook costs $225. Recalculate the mean, including the extra book. $74.67 $63 none $96.14

7-3 Choosing the Most Useful Measure Lesson Quiz 1. The top running speeds of six mammals are 15, 22, 30, 20, 26, and 37 miles per hour. What are the mean and median of this data set? Is one measure more useful than the other for describing the typical running speed of these mammals? Explain. 2. The price of a DVD at seven different stores is given below. Should Ann use the mean, median, or mode to convince a friend that the DVD is too expensive? Explain. $20, $12, $13, $17, $14, $12, $20 Mean: 25; median: 24; mean or median; there is no outlier. Mean; it makes the price seem highest.

7-4 Analyzing Data Displays Lesson Quiz: Part I Use the bar graph for Exercises 1 and 2 to answer each question. 1. What was the approximate maximum 24-hour precipitation for Virginia? 2. Emma claims that the maximum 24-hour precipitation for Florida is about 27 inches more than for Indiana. Is her claim valid? Explain. about 27 in. yes

7-4 Analyzing Data Displays Lesson Quiz: Part II Use the circle graph for Exercises 3 and 4 to answer each question. 3. In 2005, what percent of overseas visitors came from Europe or Asia? 4. Jay claims that in 2005 less than 1/4 of overseas visitors came from Asia. Is his claim valid? 77% no

7-4 Analyzing Data Displays Lesson Quiz: Part IIl Use the line graph for Exercises 5 and 6 to answer each question. 5. What was the approximate average cost of a major league baseball ticket in 1995? 6. Kelsey claims that the average price of a major league baseball ticket increased by more than $10 between 1991 and 2005. Is her claim valid? about $11 yes

7-5 Misleading Graphs Lesson Quiz Explain why each graph could be misleading and why. 1. 2. The scale does not start at 0, so it looks like fewer people like each type of animal. The vertical scale does not start at 0, so it looks like sales revenues were small.

7-6 Populations and Samples Lesson Quiz: Part I 1. Explain whether it makes sense to use a sample if you want to know the average length of dolphins at the aquarium. No; the population is small.

Beach Visits in the Past Year 7-6 Populations and Samples Lesson Quiz: Part ll 2. About 22% of Americans go to the beach each year. Amanda surveys a random sample of people from two towns. Compare the samples with the national percent. Beach Visits in the Past Year Sample Yes No Town A 56 24 Town B 16 64 The percent of people from Town A who visited the beach (70%) is greater than the national percent. The percent of people from Town B (20%) is close to the national percent.

7-6 Populations and Samples Lesson Quiz: Part IIl 3. A doctor has 600 patients. She estimates that 175 of them exercise nearly every day. She surveys a random sample of 40 patients and finds that 12 exercise nearly every day. Determine whether the doctor’s estimate is likely to be accurate. Explain. Yes; based on the sample, you can predict that 180 patients exercise nearly every day.

7-7 Selecting Samples Lesson Quiz An eye doctor wants to know how many of her patients work at a computer. Identify each type of sampling method. 1. The doctor surveys the patients in the waiting room one morning. 2. The doctor places cards in the waiting room. 3. The doctor chooses every 50th name from a database of her patients. convenience sample self-selected sample systematic sample

The sample is not biased. It is a random sample. 7-8 Identifying Sampling Errors and Bias Lesson Quiz: Part I 1. Determine whether the sample may be biased. Explain. A dentist chooses 30 patients to survey by selecting names at random from his database. 2. Determine whether the survey question may be biased. Explain. Given its enormous cost, do you support a space mission to the moon? The sample is not biased. It is a random sample. Biased; the words enormous cost lead people to answer no.

7-8 Identifying Sampling Errors and Bias Lesson Quiz: Part II 3. Vietta conducts a survey to find out whether students would like a salad bar in the cafeteria. Determine whether Vietta’s claim is valid. Explain. Sample: 50 names chosen at random from the school’s enrollment list Question: Many students have said they would like a salad bar; do you agree? Results: Claim: Most students want a salad bar added to the cafeteria. Survey: Salad Bar Yes 76% No 20% Don’t know 4% No; the question is biased. It leads students to answer yes.