Populations and Samples

NZ Level 8 (NZC) Level 3 (NCEA) [In development]

Margins of error

Using the table provided, calculate the margin of error for a $90%$90% confidence interval for a sample of size $140$140 that has a sample proportion of $0.63$0.63. Give your answer to two decimal places.

Standard Normal Probability | z-value |
---|---|

$0.9$0.9 | $1.282$1.282 |

$0.925$0.925 | $1.440$1.440 |

$0.95$0.95 | $1.645$1.645 |

$0.975$0.975 | $1.960$1.960 |

$0.99$0.99 | $2.326$2.326 |

$0.995$0.995 | $2.576$2.576 |

Easy

Approx 4 minutes

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