Determining Normality. In Exercises, refer to the indicated sample data and determine whether they appear to be from a population with a normal distribution. Assume that this requirement is loose in the sense that the population distribution need not be exactly normal, but it must be a distribution that is roughly bell-shaped.

Flight Arrival Delays The arrival delay times (minutes) as listed in Data Set 15.

Answer :

Step 1 of 1 :

Given, The arrival delay times

...class | arv delay |

-60 - -40 | 1 |

-40 - -20 | 19 |

-20 - 0 | 18 |

0 - 20 | 8 |

20 - 40 | 1 |

40 - 60 | 1 |

60 - 80 |