Research Guides@Tufts

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Description |
Call Number Areas |

Probability | QA273 |

Mathematical Statistics | QA276-280 |

Testing of Hypotheses | QA277 |

Multivariate Analysis |
QA278 |

Experimental Design | QA279 |

Time Series Analysis | QA280 |

**Mean** and **Standard Deviation **should be presented in parentheses:

The sample as a whole was relatively young (*M *= 19.22, *SD* = 3.45).

The average age of students was 19.22 years (*SD = *3.45).

**Percentages **are also most clearly displayed in parantheses with no decimal places:

Nearly half (49%) of the sample was married.

**Chi-Square **statistics are reported with degrees of freedom and sample size in parentheses, the Pearson's Chi-Square value (rounded to two decimal places), and the significance level:

The percentage of participants that were married did not differ by gender, c²(1,*N *= 90) = 0.89, *p* = .35.

**T Tests **are reported like chi-squares, but only the degrees of freedom are in parentheses. Following that,

report the *t *statistic (rounded to two decimal places) and the significance level:

There was a significance effect for gender,* t*(54) = 5.43,* p* < .001, with woman receiving higher scores than men.

**Regressions** are reported with: R², F value (F), degrees of freedom (numerator, denominator; in parentheses separated by a comma next to F), and significance level (p), β. Report the β and the

corresponding t-test for that predictors for each predictor in the regression:

Multiple regression analysis was used to test if the personality traits significantly predicted participants' ratings of aggression. The results of the regression indicated the two predictors explained 35.8% of the variance (R²=.38, F(2,55)=5.56, p<.01). It was found that extraversion significantly predicted aggressive tendencies (β = .56, p<.001), as did agreeableness (β = -.36, p<.01).

**ANOVAS **(both one-way and two-way) are reported like the *t*** **test, but there are two degrees-of-freedom numbers to report.

First report the between-groups degrees of freedom, then report the within-groups of freedom (separated by a comma). After that

report the F statistic (rounded off to two decimal places) and the significance level:

There was a significant main effect for treatment, *F*(1,145) = 5.43, *p* = .02, and a significant interaction, *F*(2,145) = 3.24, *p* = .04.

- Applying and Interpreting Statistics byCall Number: Q180.55.S7 M36 2001ISBN: 0387951105Publication Date: 2001-05-01
- Basic Concepts of Probability and Statistics byISBN: 9780898715750Publication Date: 2004-01-01[Available electronically]
- Common Errors in Statistics byCall Number: QA276 .G586 2006ISBN: 0471794317Publication Date: 2006-04-28
- Introductory Statistics byCall Number: QA276.12 .R6726 2005ISBN: 012597132XPublication Date: 2005-03-18
- Reading Statistics and Research byCall Number: QA276 .H788 2004ISBN: 0205380816Publication Date: 2003-06-16
- Statistics for the Social Sciences byISBN: 9781412905466Publication Date: 2005-08-17[Available electronically]
- Statistics for the Terrified byCall Number: QA276.12 .K73 2007ISBN: 0132328860Publication Date: 2007-01-01

Stacey Brownlie

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