Flashcards in Statistics Deck (16)

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1

## Mean

### The sum of the items divided by the number of items.

2

## How to calculate the mean for a frequency distribution?

###
1- Multiply each data value by its frequency

2- Find the sum of those products

3- Divide that answer by the total frequency of the distribution

3

## Median

###
The data item in the exact middle number.

Or the mean of the two middlemost items.

4

## Mode

###
The value that occurs most Frequently in a data set.

If more than one data value has the highest frequency then each of these data values is a mode.

5

## Midrange

### Lowest data value plus the highest data value divided by two

6

## Range

### Highest data value minus the lowest data value

7

## Frequency distribution

###
Table with two columns

column one has data values

Column two has the frequency that data occurs

8

## Inferential statistics

### Making generalizations about drawing conclusions from data

9

## Descriptive statistics

### Concerned with collecting, organizing, summarizing, and presenting data

10

## Measures of disbursement

### Used to describe the spread of data items in a data set

11

## Percentiles

### Example: if I score is in the 45th percentile this means that 45% of the scores were less than that score

12

## Z-score

### Describes how many standard deviation’s a particular data item lives above or below the mean. The formula to find the Z score equals the data item minus the mean divided by standard deviation.

13

##
Normal distribution

AKA Gaussian distribution

### On a graph it would appear to be a bell curve. The mean, median and mode are all equal and located at the center.

14

## Standard deviation

###
Found by determining how much each data item differs from the mean.

A complicated formula involving square root.

15

## Random sample

### A sample obtained in such a way that every element in the population has an equal chance of being selected for the sample

16