Week 2 Flashcards
1
Q
What are the three steps in analyzing data?
A
- simplify/summarize copious amounts of info
- identify errors
- determine if they can be analyzed by statistical tests
2
Q
If the tail is on the right, what type of skew is it?
A
positively skewed
3
Q
How do you make a histogram?
A
list the midpoints of the intervals, draw a bar for each interval
4
Q
What is the transition step in constructing a histogram?
A
frequency distributions
5
Q
How do you find the proportion in ungrouped data?
A
frequency / number of scores
6
Q
What are the general rule of making intervals in grouped data?
A
10 intervals, 5-10 width
7
Q
What is the value of finding frequencies in and below each category?
A
cumulative frequency
8
Q
How do you interpret histograms (3 steps)?
A
- identify the shape (unimodial)
- comment on where they lie (positive/negatively skewed)
- speculate on info conveyed
