Data analysis

Ratios, Rates, Proportions, Units

Set up ratios and proportions
Convert units and work with rates (speed or density)

Percentages

Find X percent of number

10% of 35 = 3.5

10% of 122 = 12.2
10% of 50 = 5

Percent Change

Center, Spread, Distribution

Mean is the average value of the dataset
Median is the middle value when the data are ordered from the least to the greatest
- - If the number of values is odd, the median is the middle value
  - If the number of values is even, the median is the average of two middle values
Mode is the value that appears the most frequently
Range is the difference between maximum and minimum values
Standard deviation measures the typical spread from the mean
Large standard deviations indicate a greater spread in the data

Models & Scatterplots

What do variables x and y represent?
read the data carefully
eliminate choices through the process of elimination rather than trying to find the correct answer

Probability

For probability questions it is important to know the formula of probability

Statistic & Margin of Error

Estimate = sample proportion x population
the larger a sample size is, the smaller the margin of error will be

Observational Studies & Experiments

Good Sample

Representative
- Includes only members of the population being studied.
Random
- Every member of the population has an equal chance of being selected.

Bad Sample

Not Representative
- Data is gathered from outside the population.
Not Random
- Data overrepresents or underrepresents a subgroup.

Page updated

Report abuse