Open book quiz! Use the formulas, tables, and figures in your book.

The population mean grade point average for all the students at the national campus in the Fall of 2000 was m = 2.173.

A sample of n = 1133 grades attained by Pohnpeian females had a grade point average of = 2.289 with a sample standard deviation of sx = 1.311. At a significance level alpha of a = 0.05, is the Pohnpei female average statistically significantly higher than the overall national campus average?

- What is Ho? m = ______

- What is H
_{1}? < ______

- What is alpha? a' = _______

- Is this a one-tailed or a two-tailed test? ___________

- What is the z
_{c}critical value for that alpha from Table 6 on page A8?

z_{c}= __________

- Calculate the z-statistic for the data?

z-statistic = ____________

- Make a sketch of the normal curve including the critical value for z, the critical area,
and the z-statistic.

- Do we reject Ho or do we fail to reject Ho?

Fall 2000 National Campus Grade Point Average Statistics

Overall

Count n of grades | Mean Grade Point Avg | Standard Deviation sx |
---|---|---|

3512 | 2.173 | 1.363 |

By State

State | Count n of grades | Mean Grade Point Avg | Standard Deviation sx |
---|---|---|---|

Chuuk | 744 | 1.906 | 1.392 |

Kosrae | 326 | 2.371 | 1.248 |

Pohnpei | 2138 | 2.238 | 1.351 |

Yap | 304 | 2.158 | 1.401 |

By State and Gender

State | Sex | Count n of grades | Mean Grade Point Avg | Standard Deviation sx |
---|---|---|---|---|

C | F | 449 | 1.993 | 1.364 |

C | M | 295 | 1.773 | 1.426 |

K | F | 143 | 2.427 | 1.259 |

K | M | 183 | 2.328 | 1.241 |

P | F | 1133 | 2.289 | 1.311 |

P | M | 1005 | 2.179 | 1.394 |

Y | F | 113 | 2.230 | 1.488 |

Y | M | 191 | 2.115 | 1.348 |