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Ch 7 Sec 3

# Ch 7 Sec 3 - Chapter7 Section3 SampleSizefor Proportions...

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Chapter 7  Section 3 1 Confidence Intervals and  Sample Size for  Proportions Mr. Kenneth Horwitz November 17, 2010

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Symbols Used in Proportion  Notation                        p   = population proportion     (read  p  “hat”) = sample proportion For a sample proportion, where  X  = number of sample units that possess the  characteristics of interest and  n  = sample size. 2 ˆ p ˆ ˆ ˆ ˆ and 1 - = = = - X n X p q or q p n n
Find a Point Estimate for p In a survey of 1219 U.S. adults, 354 said that their favorite sport  to watch is football.  Find a point       for the population  proportion of U.S. adults who say their favorite sport is football.   Then also find        . Since  X  = 354 and  n  = 1219, 3 354 ˆ 0.290402 29% 1219 X p n = = = = ˆ ˆ 1 1 0.29 0.71 71% q p = - = - = = ˆ q ˆ p

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Try it yourself In a survey of 1006 adults from the U.S. 181 said
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Ch 7 Sec 3 - Chapter7 Section3 SampleSizefor Proportions...

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