**Confidence Intervals**. In

**statistical**inference, one wishes to estimate population parameters using observed sample data. A

**confidence interval**gives an estimated range of values which is likely to include an unknown population parameter, the estimated range being calculated from a given set of sample data. (

In this regard, what is a 95% confidence interval?

A

**confidence interval**does not quantify variability. A**95**%**confidence interval**is a range of values that you can be**95**% certain contains the true mean of the population. This is not the same as a range that contains**95**% of the values.What is the 90 confidence interval?

Calculating the Confidence Interval

Confidence Interval | Z |
---|---|

85% | 1.440 |

90% | 1.645 |

95% | 1.960 |

99% | 2.576 |

What is the z score for a 95 confidence interval?

Confidence Intervals

Desired Confidence Interval | Z Score |
---|---|

90% 95% 99% | 1.645 1.96 2.576 |