- New Directions in Preventing Crime:

.Crime Prevention: any action designed to reduce the actual level of crime and or the perceived fear of crime.

I would not recommend that the sisters increase advertising expenses. If they were to increase it the sales to breakeve would increase by $1,262,478 and the breakeven volume would increase by 813 tickets.
SMS: measures Internal Validity that could easily be understood by others
Level 5: Randomized Control Experiment
Level 4: Before- After, Comparable Controls (2x), controls other variables
Level 3: Before- After, comparable conditions, control group
Level2: Before- After, non-comparable conditions
Level 1: correlation

Randomized experiments are the most convincing but only if there is a significant amount of units have been assigned. (Bigger sample size means smaller margin of error) designs have a systematic effect on outcomes high degree of internal, construct, and statistival conclusion validity

Differential Attrition: Both groups lose people so is there still a similarity between he subjects?
Internal Validity: controls threats, greater results lower evaluations had stronger effects
Replication: two studies are better than one

Types of Reviews:
Single Study: pilot study…is this going to work?
Narrative Study: Comparison of many different studies( drawback: researcher bias)
Vote Count Review: statistical significance findings in favor of the hypothesis and the number contrary to the hypothesis (tallying up)
Systematic Review: strong external validity, researcher bias, quantitative technique shows all relevant data

Threats to internal validity: History- something else is going on the same time as the experiment, Maturation-aging brings about change in the subjects, statistical regression-crime fluxates, selection- subjects are not true representatives of the population of interest,