**Confidence interval for population mean:**

**1. **Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (*The Wall Street Journal*, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in *The Wall Street Journal* article are shown for a sample of 20 European young women.

**Excel or Minitab users: **The data set is available in file named Alcohol. All data sets can be found in your eBook or on your Student CD.

162 |
82 |
199 |
174 |
97 |

170 |
222 |
115 |
115 |
169 |

164 |
98 |
132 |
171 |
0 |

93 |
0 |
93 |
110 |
434 |

Assuming the population is roughly symmetric, construct a 95% confidence interval for the mean annual consumption of alcoholic beverages by European young women (to 1 decimal).

**2. **The daily car rental rates for a sample of eight cities follow.

City |
Daily Car Rental Rate ($) |

Atlanta |
69 |

Chicago |
72 |

Dallas |
75 |

New Orleans |
67 |

Phoenix |
62 |

Pittsburgh |
65 |

San Francisco |
61 |

Seattle |
59 |

a. Compute the sample variance and the sample standard deviation for these data (to 2 decimals).

b. What is the 95% confidence interval estimate of the variance of car rental rates for the population (to 1 decimal)?

c. What is the 95% confidence interval estimate of the standard deviation for the population (to 1 decimal)?

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