Description Usage Arguments Details Value Author(s) Examples

Function to determine required sample size to be within a given margin of error.

1 |

`b` |
the desired bound. |

`sigma` |
population standard deviation. Not required if using type |

`p` |
estimate for the population proportion of successes. Not required if using type |

`conf.level` |
confidence level for the problem, restricted to lie between zero and one. |

`type` |
character string, one of |

Answer is based on a normal approximation when using type `"pi"`

.

Returns required sample size.

Alan T. Arnholt

1 2 3 4 5 6 7 8 9 10 11 12 | ```
nsize(b=.03, p=708/1200, conf.level=.90, type="pi")
# Returns the required sample size (n) to estimate the population
# proportion of successes with a 0.9 confidence interval
# so that the margin of error is no more than 0.03 when the
# estimate of the population propotion of successes is 708/1200.
# This is problem 5.38 on page 257 of Kitchen's BSDA.
nsize(b=.15, sigma=.31, conf.level=.90, type="mu")
# Returns the required sample size (n) to estimate the population
# mean with a 0.9 confidence interval so that the margin
# of error is no more than 0.15. This is Example 5.17 on page
# 261 of Kitchen's BSDA.
``` |

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