Question

A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.04 with 90% confidence if (a) she uses a previous estimate of 0.32? (b) she does not use any prior estimates?

Answer #1

a)

here margin of error E = | 0.040 | |

for90% CI crtiical Z = | 1.645 | |

estimated proportion=p= | 0.320 | |

required sample size n = |
p*(1-p)*(z/E)^{2}= |
369.00 |

b)

here margin of error E = | 0.040 | |

for90% CI crtiical Z = | 1.645 | |

estimated proportion=p= | 0.500 | |

required sample size n = |
p*(1-p)*(z/E)^{2}= |
423.00 |

A researcher wishes to estimate the proportion of adults who
have high-speed Internet access. What size sample should be
obtained if she wishes the estimate to be within 0.04 with 99%
confidence if
(a) she uses a previous estimate of 0.32?
(b) she does not use any prior estimates?

A researcher wishes to estimate the proportion of adults who
have high-speed Internet access. What size sample should be
obtained if she wishes the estimate to be within
0.04 with 90% confidence if
(a) she uses a previous estimate of 0.36?
(b) she does not use any prior estimates?

A researcher wishes to estimate the proportion of adults who
have high-speed Internet access. What size sample should be
obtained if she wishes the estimate to be within 0.04 with 95%
confidence if
A.) She uses a previous estimate of 0.32? (Round up to the
nearest integer).
B.) She does not use any prior estimates? (Round up to the
nearest integer).

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obtained if she wishes the estimate to be within 0.04 with 95%
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(b) she does not use any prior estimates?

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(a) n=
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round to the nearest integer

A researcher wishes to estimate the proportion of adults who
have high-speed Internet access. What size sample should be
obtained if she wishes the estimate to be within 0.02 with 90%
confidence if (a) she uses a previous estimate of 0.34? (b) she
does not use any prior estimates? (a) n equals ____? (Round up
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