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Lesson 5 Skills PracticeUsing Sampling to PredictIdentify each sample as biased or unbiased and describe its type. Explain your reasoning.1. To determine how many students have pets, all students in one classroom are surveyed.2. To determine the number of students who plan on attending the Valentine’s Day dance, 20 students are randomly selected from each grade level.3. To determine whether customers are satisfied with their meals, a restaurant collects comment cards that are voluntarily filled out by customers.4. To determine the most popular color of car, the color of every 12th car that crosses an intersection is recorded.5. To determine the most popular major league baseball team among its readers, a sports magazine polled by telephone a random selection of its pingNumberPepperoni10Veggies8Cheese76. The student council would like to sell pizza slices during home basketball games as a fundraiser. During a home game with 250 people in attendance, they surveyed every 10th spectator to enter the gym about their favorite pizza toppings. Their results are shown in the table. Is this sampling method valid? If so, how many pepperoni pizzas should be ordered if they order 25 pizzas? Explain your reasoning.Lesson 5 Homework PracticeUsing Sampling to PredictIdentify each sample as biased or unbiased and describe its type. Explain your reasoning.1. To determine how many people in a town support a new tax levy, 200 people are randomly selected from a phone book and then surveyed over the phone.2. To determine the number of households in a town that recycle, 40 households from the same street are polled.3. To determine the usual demand of a Web site, the number of users currently visiting the Web siteis recorded every hour.5209615193114. The yearbook staff wanted to find out how many students would buy a yearbook. So, the staff surveyed 15 students who were in the school library after school. The results are in the graph. Is this sampling method valid? If so, about how many of the 1287 students in the school will buy yearbooks?5. A library would like to see how many of its patrons would be interested in regularly checking out books from an enlarged print section. They randomly surveyed 200 patrons and 6 patrons responded that they would regularly check out books from an enlarged print section. If the library has a total of 3200 patrons, how many people can they expect to regularly check out books from an enlarged print section? ................
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