Flashcards in Chapter 2- Frequency Distributions Deck (13):

1

## What are frequency tables typically used for?

### Frequency table are used for discrete variables and displays counts. proportions, and percentages. Visual depiction of data that shows how often each value occurred.

2

## How do you calculate frequency?

### Sum all of the frequency counts

3

## How do you calculate proportion?

### Divide the specific value by the total frequency

4

## How do you calculate percentage?

### Cannot exceed 100%. Percentages are typically the digits behind the decimal point.

5

## What is the function of a grouped frequency table?

### A grouped frequency table is used when data is continuous (scale) or can take on a range of values. One can create intervals to bin data.

6

## How are bins created?

### Bins are created by determining rage of data (smallest to largest values), determine appropriate interval size, then list interval and count frequencies

7

## What are histograms used for?

### Histograms are used for continuous (scale) data. The X-axis (across the bottom) are the values of variable (in intervals). The Y-axis (vertically) is for frequency or proportions

8

## What is the difference between a bar graph and a histogram?

### Bar graph provide scores for nominal data and categories do not need to be arranged in a particular order; histograms provide frequencies for scale data

9

## What are frequency polygons used for?

### Polygons are graphs where the x-axis represents midpoints of intervals and the y-axis represents frequencies. A dot is placed at the frequency for each value, then the dots are connected.

10

## What is a normal distribution?

### A normal distribution is a specific frequency distribution that is a bell-shaped, symmetric unimodal curve- 1 peak. It looks like a mountain.

11

## What are skewed distributions?

### Skewed distributions are distributions in which one of the tails of the distribution is pulled away from the center. The tail goes to the right or to the left.

12

## What is a positively skewed distribution?

###
A positively skewed distribution is a

distribution where the tail of the distribution extends to the right--a positive direction also called the floor effect (prevents a variable from taking on values below a certain point).

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