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(1 point) In 2012, the percentage of cell phone owners who used their cell phone to...

(1 point) In 2012, the percentage of cell phone owners who used their cell phone to send or receive text messages was 80%. A polling firm contacted a simple random sample of 1400 people chosen from the population of cell phone owners. If p is the proportion of cell phone owners who used their phone to text, then what was the the probability that p^ was between 0.79 and 0.81?

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In 2012, the percentage of cell phone owners who used their cell phone to send or receive text messages was 80%. A polling firm contacted a simple random sample of 1400 people chosen from the population of cell phone owners. If p is the proportion of cell phone owners who used their phone to text, then

what was the the probability that p^ was between 0.79 and 0.81?

n= 1400 ,p = 0.80

Mean of the sample distribution is,

The standard error of the sampling distribution of sampling proportion is,

The probability is,

(Using the excel function, (NORMSDIST(z)))

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