Some predictions can be based on what is known about the past, assuming that conditions are pretty much the same now.
Learning Goal 2
Statistical predictions (as for rainy days, accidents) are typically better for how many of a group will experience something than for which members of the group will experience it—better for how often something will happen than for exactly when.
Learning Goal 3a
Summary predictions are usually more accurate for large collections of events than for just a few.
Learning Goal 3b
Even very unlikely events may occur fairly often in very large populations.
Learning Goal 4a
Spreading data out on a number line helps to see what the extremes are, where they pile up, and where the gaps are.
Learning Goal 4b
A summary of data includes where the middle is and how much spread is around it.
Learning Goal 5a
A small part of something may be special in some way and not give an accurate picture of the whole.
Learning Goal 5c
There is a danger of choosing only the data that show what is expected by the person doing the choosing.
Learning Goal 6
Events can be described in terms of being more or less likely, impossible, or certain.