statistic |
A __________ is a numerical summary of a sample. |

parameter |
A __________ is a numerical summary of a population. |

matched |
A matched-pairs design is an experimental design in which the experimental units are ___________. |

lurking variable |
A _____________ is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study. |

Simple random sampling |
__________ is the process of using chance to select individuals from a population to be included in the sample. |

1 |
In a relative frequency distribution, the sum of relative frequencies should be ______. |

residual |
A ______ is the difference between the corresponding observed and predicted values. |

0 |
The sum of the deviations about the mean always equals _________. |

2 |
The first quartile of the data 2, 4, 6, 6, 8, 9, 9, 10 is _________. |

68% |
For a bell-shaped data distribution, __________ of data are within one standard deviation of the mean. |

2 |
The mean and standard deviation of a sample are 12 and 3, respectively. The z-score of the data 18 is _________. |

True |
Inferences based on voluntary response samples are generally not reliable. |

True |
If the results of the sample are not representative of the population, then the sample has bias. |

True |
Generally, the goal of an experiment is to determine the effect that treatments will have on the response variable. |

False |
A data set will always have exactly one mode. |

True |
The 75th percentile is the value that separates the lower 75% of data from the upper 25%. |

False |
The correlation coefficient r between two variables x and y can be +2 . |

True |
A designed experiment is a controlled study conducted to determine the e?ect that varying one or more explanatory variable has on a response variable. |

True |
If the scatter diagram of the residues has a pattern, then the least-squares regression line is not the appropriate model. |

# Statistics Exam 1

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