Numerical variables can be subdivided into which two types? | |

A. Cross-sectional and discrete | | | |

B. Diverse and categorical | | | |

C. Nominal and progressive | | | |

D. Discrete and continuous | |

Answer Key: D | Part 2 of 9 - | 2.0/ 2.0 Points |

Question 2 of 25 | 1.0/ 1.0 Points |

A jar contains four white marbles, five red marbles, and six black marbles. If a marble is selected at random, find the probability that it is white or black . | |

A. 2/15 | | | |

B. 2/3 | | | |

C. 1/5 | | | |

D. 2/5 | |

Answer Key: B | Question 3 of 25 | 1.0/ 1.0 Points |

The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker? | |

A. 1/4 | | | |

B. 1/8 | | | |

C. 5/8 | | | |

D. 2/5 | |

Answer Key: C | Part 3 of 9 - | 3.0/ 3.0 Points |

Question 4 of 25 | 1.0/ 1.0 Points |

A discrete probability distribution: | |

A. lists all of the possible values of the random variable and their corresponding probabilities | | | |

B. is a tool that can be used to incorporate uncertainty into models | | | |

C. is the distribution of multiple random variables | | | |

D. can be estimated from long-run proportions | |

Answer Key: A | Question 5 of 25 | 1.0/ 1.0 Points |

A multiple choice quiz consists of 6 questions, each with 4 possible answers. If a student guesses at the answer to each question, then the mean number of correct answers is | |

A. 6.00 | | | |

B. 1.50 | | | |

C. 4.00 | | | |

D. 10.00 | |

Answer Key: B | Question 6 of 25 | 1.0/ 1.0 Points |

In one town 33% of the households have a vehicle with all-wheel drive. If 4 households are selected at random, what is the probability that all 4 have vehicles with all-wheel drive?