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According to the Pew Internet &American Life Project. 75% of American adults use the internet. The Pew project authors also peported on the percentage of Americans who use the internet by age group. The data in the in the agefile group was consistent with their findings. these data were obtained from a sample of 100 internet users in the 30-49 age group and 200 internet users in the 50-64 age group. A yes indicates the survey respondent had used the internet; a no indicates the survey respondent had not. formulate hypotheses that could be used to determine whether the percentage of internet users in the two age groups differs from the overall average of 75%.

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2 answers
  1. Null hypothesis:
    Ho: µ = .75 -->meaning population proportion equals .75 (or 75%)

    Alternate or alternative hypothesis:
    Ha: µ ≠ .75 -->meaning population proportion does not equal .75 (or 75%)

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  2. z=-2.26 => p = 0.0238

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