# Exercises

# Mix and Match

Match each definition on the left with a mathematical expression or term on the right.

1. Plot used for visual comparison of results in two (or more) groups |
(a) t = − 4.6 |

2. Difference between the averages in two samples |
(b) t = 1.3 |

3. Difference between the averages in two populations |
(c) μ_{1} − μ_{2} |

4. Name given to the variable that specifies the treatments in an experiment |
(d) $\sqrt{\frac{{s}_{1}^{2}}{{n}_{1}}+\frac{{s}_{2}^{2}}{{n}_{2}}}$ |

5. Estimate of the standard error of the difference between two sample means |
(e) n − 1 |

6. Avoids confounding in a two-sample comparison |
(f) ${\overline{x}}_{1}-{\overline{x}}_{2}$ |

7. Test statistic indicating a statistically significant result if α = 0.05 and H_{0}: μ_{1} − μ_{2} ≥ 0 |
(g) Confounding |

8. Test statistic indicating that a mean difference is not ... |

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