A researcher wishes to estimate the proportion of adults who
have high-speed internet access. What size...
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A researcher wishes to estimate the proportion of adults whohave high-speed internet access. What size sample should beobtained if she wishes the estimate to be within 0.01 with 90%confidence if...
a. She uses a previous estimate of 0.42? N=
b. She does not use any prior estimates? N=
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Solution Given that 0421 1 042 058margin of error E 001At 90 confidence level z 1 90 1 090 0102 005Z2
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