The two terms are often used interchangably. Although there are some commonly understood distinctions, there are also grey areas: statistics are certainly a kind of data, and data are used to generate statistics.
Statistics often are:
- facts or figures
- time series
- tables, charts, or graphs
- to support an argument
- 'ready to use'
Data can generally be used to:
- test hypotheses
- generate custom tables
- look at responses of individuals
- analyze in SPSS, SAS, or Stata
- do Regression, t-test, ANOVA, etc
Another distinction to consider is whether you need microdata or aggregate data. Microdata is the original, unprocessed (except to protect privacy of participants) information: for example, income reported by each household, height and species of each tree in a park. Aggregate data is summarized and combined in some way: average income in a census block, number of oak trees in a city park.