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1-4_example2 - Student Grady Simonton Course Math119...

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Unformatted text preview: Student: Grady Simonton Course: Math119: Elementary Statistics - Spring 2.010 - CRN: 49239 Instructor: Shawn Parvini - 16 weeks Date: 2/18/10 Book: Triola: Elementary Statistics, 11e Time: 10:53 ANI a. In a poll, 53% of 1356 surveyed adults said that global warming is "very alarming". What is the actual number of adults who said that global warming is "very alarming"? b. Among the 1356 surveyed adults, 213 said that global warming is "not at all alarming". What is the percentage of people who chose "not at all alarming"? a. To find some percentage of an amount, drop the % symbol and divide the percentage value by 100, then multiply. 53 To find 53% of 1356 adults surveyed, calculate 1 X 1356. First, divide 53 by 100. 53 — = 0.53 100 Next, multiply 0.53 by 1356. 0.53 X 1356:: 719 Thus, 719 adults said that global warming is alarming. b. To find some percentage, divide the sample value by the total value, and multiply by 100%. First, figure out which number is the sample, and which is the result. A sample is a subcollection of members selected from a population. The sample in this example is 1356. The results of a survey are the data collected in the survey. The result in this example is 213. First, divide 213 by 1356. 213 —=0.157 1356 Now, multiply 0.157 by 100%. 0.157 X 100% = 15.?% Thus, 213 is 15.7% of 1356. Page 1 ...
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