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Warm Up Evaluate. 1. t + 15 for t = –5 2. n + (–13) for n = 7 Solve for x . 3. = –21

9-1. Samples and Surveys. x. –3. Course 3. Warm Up Evaluate. 1. t + 15 for t = –5 2. n + (–13) for n = 7 Solve for x . 3. = –21 4. 7 x = –98. 10. –6. x = 63. x = –14. 9-1. Samples and Surveys. Course 3. Problem of the Day

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Warm Up Evaluate. 1. t + 15 for t = –5 2. n + (–13) for n = 7 Solve for x . 3. = –21

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  1. 9-1 Samples and Surveys x –3 Course 3 Warm Up Evaluate. 1.t + 15 for t = –5 2.n + (–13) for n = 7 Solve for x. 3. = –21 4. 7x = –98 10 –6 x = 63 x = –14

  2. 9-1 Samples and Surveys Course 3 Problem of the Day Mr. Gray’s 29 students will be sitting in the gym to watch a play. There are two rows of five chairs, three rows of four chairs, and four rows of two chairs. Is there enough room for all the students to sit? yes

  3. 9-1 Samples and Surveys Course 3 TB P. 462-465 Learn to identify sampling methods and to recognize biased samples.

  4. 9-1 Samples and Surveys Course 3 Insert Lesson Title Here Vocabulary population sample randomsample systematic sample stratified sample convenience sample voluntary-response sample biasedsample

  5. 9-1 Samples and Surveys Course 3 A fitness magazine printed a readers’ survey. Statements 1, 2, and 3 are interpretations. Which do you think the magazine would use? 1. The average American exercises 3 time a week. 2. The average reader of this magazine exercises 3 time a week. 3. The average reader who responded to the survey exercises 3 time a week.

  6. 9-1 Samples and Surveys Course 3 A fitness magazine printed a readers’ survey. Statements 1, 2, and 3 are interpretations. Which do you think the magazine would use? The population is the entire group being studied. The sample is the part of the population being surveyed. To get accurate information, it is important to use a good sampling method. In a random sample, each member of the population has an equal chance of being selected. A random sample is best, but other methods can be used.

  7. 9-1 Samples and Surveys Course 3

  8. 9-1 Samples and Surveys Course 3 Additional Example 1A: Identifying Sampling Methods Identify the sampling method used. In a county survey, Democratic Party members whose names begin with the letter D are chosen. systematic The rule is to survey members whose names begin with D.

  9. 9-1 Samples and Surveys Course 3 Additional Example 1B: Identifying Sampling Methods Identify the sampling method used. A telephone company randomly chooses customers to survey about its service. random Customers are chosen by chance.

  10. 9-1 Samples and Surveys Course 3 Additional Example 1C: Identifying Sampling Methods Identify the sampling method used. A high school randomly chooses three classes from each grade and then draws three random names from each class to poll about lunch menus. The three classes are the random subgroups. Names are chosen randomly from within the classes. stratified

  11. 9-1 Samples and Surveys Course 3 Sometimes, these sampling methods result in biased samples. A biased sample does not accurately represent the population. The data collected from biased samples is not reliable.

  12. 9-1 Samples and Surveys Course 3 Additional Example 2A: Identifying Biased Samples Identify the population and the sample. Give a reason why the sample could be biased. A record store manager asks customers who make a purchase how many hours of music they listen to each day. Customers who make a purchase might be more interested in music than others in the store. Customers who make a purchase. Record store customers.

  13. 9-1 Samples and Surveys Course 3 Additional Example 2B: Identifying Biased Samples Identify the population and the sample. Give a reason why the sample could be biased. An eighth-grade student council member polls classmates about a new school mascot. She polls more eighth-graders than students in other grades. Students in the school Classmates

  14. 9-1 Samples and Surveys Course 3 Additional Example 2C: Identifying Biased Samples Identify the population and the sample. Give a reason why the sample could be biased. A radio DJ asks listeners for feedback about the type of music played on a radio show. People who listen to the radio show The radio only receives feedback from people who listen to that station, and therefore who already enjoy the type of music played on the station. People who hear the question and who call in

  15. 9-1 Samples and Surveys Course 3 Insert Lesson Title Here Lesson Quiz: Part I Identify the population and sample. Give a reason why the sample could be biased. 1. A high school principal asks the first three people who leave the school play whether they liked it. People that enjoy a play may not leave as early as someone who didn’t. The first 3 people leaving People who attended the play

  16. 9-1 Samples and Surveys Course 3 Insert Lesson Title Here Lesson Quiz: Part II Identify the sampling method used. 2. At a baseball game, 10 sections are chosen at random and 10 random people from each section are polled. 3. A telemarketer calls the people that have a last name beginning with H. stratified systematic

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