document.write( "Question 1142967: In a nationwide polls of 1,500 randomly selected U.S. residents, 77% said that they liked pizza. In a poll of 1,500 randomly selected U.S. residents one month later, 75% responded that they liked pizza.\r
\n" ); document.write( "\n" ); document.write( "a. Does the polling evidence support the claim that pizza declined in popularity over the month between polls? Explain why or why not.
\n" ); document.write( "b. Using statistical terminology, precisely identify the population parameter the two polls were attempting to measure. How does a parameter differ from a statistic?
\n" ); document.write( "c. Based on the two polls, what would you say to someone who guessed that the population parameter the polls are trying to measure is really only 50%? \n" ); document.write( "

Algebra.Com's Answer #763792 by Boreal(15235) $\"\"$ $\"About$

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One can do a two-proportion test and find that the z-value for different is 1.28 (or -1.28, depending how one sets up the test).
\n" ); document.write( "The p-value for that is 0.20, so by most tests this is not statistically significant.\r
\n" ); document.write( "\n" ); document.write( "Said another way, if there had been no change in the interval, the probability of having a repeat sample at least this different would be 0.20.\r
\n" ); document.write( "\n" ); document.write( "The parameter one is attempting to determine is the true proportion of adults in the US who say they like pizza.\r
\n" ); document.write( "\n" ); document.write( "For those who think it is 50%, it is essentially 100% likely that it is not 50% but much higher, around 75-77%. \n" ); document.write( "

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