Methods used that summarize or describe characteristics of data are called _______ statistics. |
descriptive |

A value at the center or middle of a data set is a(n) _____. |
measure of center |

Which of the following is NOT a measure of center? -census |
census |

Which of the following is NOT a characteristic of the mean? -The mean is relatively reliable. |
The mean is called average by statisticians. |

The measure of center that is the value that occurs with the greatest frequency is the |
mode |

Which of the following is always true? -For skewed data, the mode is farther out in the longer tail than the median. |
In a symmetric and bell-shaped distribution, the mean, median, and mode are the same |

Which measure of variation is very sensitive to extreme values? |
Range |

Which of the following is NOT a property of the standard deviation? -The value of the standard deviation is never negative |
When comparing variation in samples with different means, it is good practice to compare the two sample standard deviations. |

The Range Rule of Thumb roughly estimates the standard deviation of a data set as _______. |
S= RANGE/4 |

For data sets having a distribution that approximately bell-shaped, ______ states that about 68% of all data values fall within one standard deviation from the mean. |
the Empirical Rule |

The square of the standard deviation is called the _______. |
variance |

When a data is converted to a standardized scale representing the number of standard deviations the data value lies from the mean, we call the new value a ______. |
z-score |

A data value is considered ______ if its z-score is less than -2 or greater than 2. |
unusual |

Whenever a data value is less than the mean, ______. |
the corresponding z-score is negative |

Which of the following is NOT a value in the 5-number summary? -Median |
Mean |

A _______ exists between two variables when the values of one variable are somehow associated with the values of the other variable. |
correlation |

When determining whether there is a correlation between two variables, one should be a ______ to explore the data visually. |
scatter-plot |

Which of the following statements about correlation is true? -We say that there is a positive correlation between x and y if there x-values increase as the corresponding y-values increase. |
We say that there is a positive correlation between x and y if the x-values increase as the corresponding y-values increase. |

The ________ measures the strength of the linear correlation between the paired quantitative x- and y-values in a sample. |
linear correlation coefficient r |

Which of the following is NOT a requirement in determining whether there is a linear correlation between two variables? -Any outliers must be removed if they are known to be errors. |
If r>1, then there is a positive linear correlation |

Which of the following is NOT a property of the linear correlation coefficient r? -The value of r is always between -1 and 1 inclusive. |
The linear correlation coefficient is robust. That is, a single outlier will not affect the value of r. |

Which of the following is NOT one of three common errors involving correlation? – Correlation does not imply causality. |
Correlation does not imply causality |

When making predictions based on regression lines, which of the following is not listed as a consideration? -Use the regression equation for predictions only if the graph of regression line on the scatter-plot confirms that the regression line fits the point reasonably well. |
Use the regression line for prediction only if the data go far beyond the scope of the available sample data |

In a scatter-plot, a(n) _________ is a point lying far away from the other data points. |
outlier |

# VOCAB for Test 2- 3-2 to 3-4, 10-2 & 10-3

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