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# Learning Statistics: Library Resources

## Call Number Areas to Browse in Statistical Science:

 Description Call Number Areas Probability QA273 Mathematical Statistics QA276-280 Testing of Hypotheses QA277 Multivariate Analysis QA278 Experimental Design QA279 Time Series Analysis QA280

## Reporting Statistics in APA Style

Mean and Standard Deviation should be presented in parentheses:

The sample as a whole was relatively young (= 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,= 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 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.

## Subject Guide Ari Gofman
Contact:
Tisch Library
35 Professors Row
Medford, MA 02155
617-627-7124