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Intro to Stats > CH 2 > Flashcards

Flashcards in CH 2 Deck (14):
1

Relative Frequency

The proportion (or percent) of observations within a category. Divide the frequency by the sum of all of the frequencies

2

Inferential statistics

Take a sample of data and then apply it to the population.

3

Descriptive statistics

Organizing and summarizing data

4

Uniform Distribution

The frequency of each value of the variable is evenly spread out across the values of the variable

5

Bell-Shaped Distribution

The highest frequency occurs in the middle and frequencies tail off to the left and right of the middle so the graph looks like the profile of a bell.

6

Skewed Right

The tail to the right of the peak is longer than the tail to the left of the peak.

7

Skewed Left

The tail to the left of the peak is longer than the tail to the right of the peak

8

Determine the class width

The width is equal to the width of each bar on the histogram.
- Range of values / class width

9

Determine percentage decrease

a - b / a

10

Determine percentage increase

a-b/b
when b = low number

11

The misery index

Sum of unemployment rate and the inflation rate

12

Classes

aka How many categories are there?

13

Lower class limit

= lowest value in class

14

Upper class limit

= highest value in class